Regular Expressions 101

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An explanation of your regex will be automatically generated as you type.
Detailed match information will be displayed here automatically.
  • All Tokens
  • Common Tokens
  • General Tokens
  • Anchors
  • Meta Sequences
  • Quantifiers
  • Group Constructs
  • Character Classes
  • Flags/Modifiers
  • Substitution
  • A single character of: a, b or c
    [abc]
  • A character except: a, b or c
    [^abc]
  • A character in the range: a-z
    [a-z]
  • A character not in the range: a-z
    [^a-z]
  • A character in the range: a-z or A-Z
    [a-zA-Z]
  • Any single character
    .
  • Alternate - match either a or b
    a|b
  • Any whitespace character
    \s
  • Any non-whitespace character
    \S
  • Any digit
    \d
  • Any non-digit
    \D
  • Any word character
    \w
  • Any non-word character
    \W
  • Non-capturing group
    (?:...)
  • Capturing group
    (...)
  • Zero or one of a
    a?
  • Zero or more of a
    a*
  • One or more of a
    a+
  • Exactly 3 of a
    a{3}
  • 3 or more of a
    a{3,}
  • Between 3 and 6 of a
    a{3,6}
  • Start of string
    ^
  • End of string
    $
  • A word boundary
    \b
  • Non-word boundary
    \B

Regular Expression
No Match

/
/
g

Test String

Code Generator

Language

Generated Code

import java.util.regex.Matcher; import java.util.regex.Pattern; public class Example { public static void main(String[] args) { final String regex = "(?<code1>class=\"relativetime\">)(?<code2>.+)(?<code3><\\/span>)"; final String string = "<!DOCTYPE html>\n" + "<html>\n" + "<head>\n\n" + " <title>Newest Questions - Page 44 - Electrical Engineering Stack Exchange</title>\n" + " <link rel=\"shortcut icon\" href=\"//cdn.sstatic.net/electronics/img/favicon.ico\">\n" + " <link rel=\"apple-touch-icon image_src\" href=\"//cdn.sstatic.net/electronics/img/apple-touch-icon.png\">\n" + " <link rel=\"search\" type=\"application/opensearchdescription+xml\" title=\"Electrical Engineering Stack Exchange\" href=\"/opensearch.xml\">\n\n" + " <script type=\"text/javascript\" src=\"//ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js\"></script>\n" + " <script type=\"text/javascript\" src=\"//cdn.sstatic.net/js/stub.js?v=5d233283ca8d\"></script>\n" + " <link rel=\"stylesheet\" type=\"text/css\" href=\"//cdn.sstatic.net/electronics/all.css?v=672ddec9ce04\">\n\n\n" + " <script type=\"text/x-mathjax-config\">\n" + " MathJax.Hub.Config({\"HTML-CSS\": { preferredFont: \"TeX\", availableFonts: [\"STIX\",\"TeX\"], linebreaks: { automatic:true }, EqnChunk: (MathJax.Hub.Browser.isMobile ? 10 : 50) },\n" + " tex2jax: { inlineMath: [ [\"\\\\$\", \"\\\\$\"] ], displayMath: [ [\"$$\",\"$$\"], [\"\\\\[\", \"\\\\]\"] ], processEscapes: true, ignoreClass: \"tex2jax_ignore|dno\" },\n" + " TeX: { noUndefined: { attributes: { mathcolor: \"red\", mathbackground: \"#FFEEEE\", mathsize: \"90%\" } }, Macros: { href: \"{}\" } },\n" + " messageStyle: \"none\"\n" + " });\n" + " </script>\n" + " <script type=\"text/javascript\" src=\"http://cdn.mathjax.org/mathjax/latest/MathJax.js?config=TeX-AMS_HTML\"></script>\n\n" + " <script type=\"text/javascript\">\n" + " StackExchange.ready(function () {\n" + " StackExchange.realtime.init('sockets.ny.stackexchange.com');\n" + " StackExchange.realtime.subscribeToInboxNotifications();\n" + " StackExchange.realtime.subscribeToReputationNotifications('135');\n" + " });\n" + " </script>\n" + " <script type=\"text/javascript\">\n" + " StackExchange.init({\"stackAuthUrl\":\"https://stackauth.com\",\"serverTime\":1377686850,\"styleCode\":true,\"enableUserHovercards\":true,\"site\":{\"name\":\"Electrical Engineering Stack Exchange\",\"description\":\"Q&A for electronics and electrical engineering professionals, students, and enthusiasts\",\"isNoticesTabEnabled\":true,\"recaptchaPublicKey\":\"6LdsB7sSAAAAAAzjgEF_Hd8vXv-C42sa_KyofaGR\",\"enableSocialMediaInSharePopup\":true},\"user\":{\"fkey\":\"964caaf8350dc8ae69af722ba29b4a1d\",\"isAnonymous\":true}});\n" + " StackExchange.using.setCacheBreakers({\"js/prettify-full.js\":\"6c261bebf56a\",\"js/moderator.js\":\"ed7a8238b2f8\",\"js/full-anon.js\":\"5f9bf5810297\",\"js/full.js\":\"027ac5ea264e\",\"js/wmd.js\":\"cff10cca4fd9\",\"js/third-party/jquery.autocomplete.min.js\":\"e5f01e97f7c3\",\"js/mobile.js\":\"82a79dbb7259\",\"js/help.js\":\"6e6623243cf6\",\"js/tageditor.js\":\"450c9e8426fc\",\"js/tageditornew.js\":\"b6c68ad4c7dd\",\"js/inline-tag-editing.js\":\"8e84e8a137f7\",\"js/revisions.js\":\"d3e781ee5528\",\"js/review.js\":\"947758ba83ea\",\"js/tagsuggestions.js\":\"aa48ef6154df\",\"js/post-validation.js\":\"bb996020492a\",\"js/explore-qlist.js\":\"1c5bbd79b562\",\"js/events.js\":\"27a33f0b2cad\"});\n" + " StackExchange.using.setCacheBreakers({\"js/mathjax-editing.js\":\"6da1b6cfe19f\",\"js/external-editor.js\":\"51c0a8d46d29\"});\n" + " </script>\n" + " <script type=\"text/javascript\">\n" + " StackExchange.using(\"gps\", function() {\n" + " StackExchange.gps.init(true);\n" + " });\n" + " </script>\n\n" + " <script type=\"text/javascript\">\n" + " StackExchange.ready(function () {\n" + " $('#nav-tour').click(function () {\n" + " StackExchange.using(\"gps\", function() {\n" + " StackExchange.gps.track(\"aboutpage.click\", { aboutclick_location: \"headermain\" }, true);\n" + " });\n" + " });\n" + " });\n" + " </script>\n" + "</head>\n" + "<body class=\"questions-page\">\n" + " <noscript><div id=\"noscript-padding\"></div></noscript>\n" + " <div id=\"notify-container\"></div>\n" + " <div id=\"overlay-header\"></div>\n" + " <div id=\"custom-header\"></div>\n\n" + " <div class=\"container\">\n" + " <div id=\"header\" class=headeranon>\n" + " <div id=\"portalLink\">\n" + " <a class=\"genu\" href=\"http://stackexchange.com\" onclick=\"StackExchange.ready(function(){genuwine.click();});return false;\">Stack Exchange</a>\n" + " </div>\n" + " <div id=\"topbar\">\n" + " <div id=\"hlinks\">\n\n" + "<span id=\"hlinks-user\"></span>\n" + "<span id=\"hlinks-nav\"> <a href=\"/users/login?returnurl=%2fquestions%3fpage%3d44%26sort%3dnewest\">sign up</a>\n\n" + " <span class=\"lsep\">|</span>\n" + " <a href=\"/users/login?returnurl=%2fquestions%3fpage%3d44%26sort%3dnewest\">log in</a>\n\n" + " <span class=\"lsep\">|</span>\n" + "</span>\n" + "<span id=\"hlinks-custom\"></span>\n" + " </div>\n" + " <div id=\"hsearch\">\n" + " <form id=\"search\" action=\"/search\" method=\"get\" autocomplete=\"off\">\n" + " <div>\n" + " <input autocomplete=\"off\" name=\"q\" class=\"textbox\" placeholder=\"search\" tabindex=\"1\" type=\"text\" maxlength=\"240\" size=\"28\" value=\"\">\n" + " </div>\n" + " </form>\n" + " </div>\n" + " </div>\n" + " <br class=\"cbt\">\n" + " <div id=\"hlogo\">\n" + " <a href=\"/\">\n" + " Electrical Engineering\n" + " </a>\n" + " </div>\n" + " <div id=\"hmenus\">\n" + " <div class=\"nav mainnavs mainnavsanon\">\n" + " <ul>\n" + " <li class=\"youarehere\"><a id=\"nav-questions\" href=\"/questions\">Questions</a></li>\n" + " <li><a id=\"nav-tags\" href=\"/tags\">Tags</a></li>\n" + " <li><a id=\"nav-tour\" href=\"/about\">Tour</a></li>\n" + " <li><a id=\"nav-users\" href=\"/users\">Users</a></li>\n" + " </ul>\n" + " </div>\n" + " <div class=\"nav askquestion\">\n" + " <ul>\n" + " <li>\n" + " <a id=\"nav-askquestion\" href=\"/questions/ask\">Ask Question</a>\n" + " </li>\n" + " </ul>\n" + " </div>\n" + " </div>\n" + " </div>\n\n\n\n\n" + " <div id=\"content\">\n\n" + "<div id=\"mainbar\">\n" + " <div class=\"subheader\">\n" + " <h1 id=\"h-all-questions\">All Questions</h1>\n" + " <div id=\"tabs\">\n" + "<a class=\"youarehere\" href=\"/questions?sort=newest\" title=\"the most recently asked questions\">newest</a>\n" + "<a href=\"/questions?sort=featured\" title=\"questions with open bounties\"><span class='bounty-indicator-tab'>3</span>featured</a>\n" + "<a href=\"/questions?sort=frequent\" title=\"questions with the most links\">frequent</a>\n" + "<a href=\"/questions?sort=votes\" title=\"questions with the most votes\">votes</a>\n" + "<a href=\"/questions?sort=active\" title=\"questions that have recent activity\">active</a>\n" + "<a href=\"/questions?sort=unanswered\" title=\"questions that have no upvoted answers\">unanswered</a>\n\n" + " </div>\n" + " </div>\n\n" + " <div id=\"questions\">\n\n" + "<div class=\"question-summary\" id=\"question-summary-78358\">\n" + " <div class=\"statscontainer\">\n" + " <div class=\"statsarrow\"></div>\n" + " <div class=\"stats\">\n" + " <div class=\"vote\">\n" + " <div class=\"votes\">\n" + " <span class=\"vote-count-post \"><strong>-1</strong></span>\n" + " <div class=\"viewcount\">votes</div>\n" + " </div>\n" + " </div>\n" + " <div class=\"status answered\">\n" + " <strong>1</strong>answer\n" + " </div>\n" + " </div>\n\n\n\n" + "<div class=\"views \" title=\"34 views\">\n" + " 34 views\n" + "</div>\n" + " </div>\n" + " <div class=\"summary\">\n" + " <h3><a href=\"/questions/78358/controlling-2-kw-230v-infra-red-short-wave-heaters-using-electronic-device\" class=\"question-hyperlink\">controlling 2 kw,230v- infra red short wave heaters using electronic device</a></h3>\n" + " <div class=\"excerpt\">\n" + " i want to control infra red short wave heaters 230v,2kw, with some electronic device,\n" + "it is an open loop system,where i want to give analog signal to heater from 0 to 100% .\n" + "i cant take Thermocouple ...\n" + " </div>\n\n" + " <div class=\"tags t-voltage-regulator t-solid-state-relay t-dimming\">\n" + " <a href=\"/questions/tagged/voltage-regulator\" class=\"post-tag\" title=\"show questions tagged 'voltage-regulator'\" rel=\"tag\">voltage-regulator</a> <a href=\"/questions/tagged/solid-state-relay\" class=\"post-tag\" title=\"show questions tagged 'solid-state-relay'\" rel=\"tag\">solid-state-relay</a> <a href=\"/questions/tagged/dimming\" class=\"post-tag\" title=\"show questions tagged 'dimming'\" rel=\"tag\">dimming</a>\n\n" + " </div>\n" + " <div class=\"started fr\">\n\n\n" + " <div class=\"user-info \">\n" + " <div class=\"user-action-time\">\n\n\n" + " asked <span title=\"2013-08-08 10:06:07Z\" class=\"relativetime\">Aug 8 at 10:06</span>\n" + " </div>\n" + " <div class=\"user-gravatar32\">\n" + " <a href=\"/users/27245/user27245\"><div class=\"\"><img src=\"https://www.gravatar.com/avatar/73e6c66117a190c5cc03a90caf569aae?s=32&d=identicon&r=PG\" alt=\"\" width=\"32\" height=\"32\"></div></a>\n" + " </div>\n" + " <div class=\"user-details\">\n" + " <a href=\"/users/27245/user27245\">user27245</a><br>\n" + " <span class=\"reputation-score\" title=\"reputation score\" dir=\"ltr\">1</span>\n" + " </div>\n" + " </div>\n\n" + " </div>\n" + " </div>\n" + "</div>\n\n" + "<div class=\"question-summary\" id=\"question-summary-78355\">\n" + " <div class=\"statscontainer\">\n" + " <div class=\"statsarrow\"></div>\n" + " <div class=\"stats\">\n" + " <div class=\"vote\">\n" + " <div class=\"votes\">\n" + " <span class=\"vote-count-post \"><strong>0</strong></span>\n" + " <div class=\"viewcount\">votes</div>\n" + " </div>\n" + " </div>\n" + " <div class=\"status unanswered\">\n" + " <strong>0</strong>answers\n" + " </div>\n" + " </div>\n\n\n\n" + "<div class=\"views \" title=\"47 views\">\n" + " 47 views\n" + "</div>\n" + " </div>\n" + " <div class=\"summary\">\n" + " <h3><a href=\"/questions/78355/how-to-synchronize-internal-rtc-to-computer-time-and-date\" class=\"question-hyperlink\">how to synchronize internal RTC to computer time and date</a></h3>\n" + " <div class=\"excerpt\">\n" + " i am using pic18f67k22 controller.i already configure and initialize internal RTC. But i want start RTC to computer time.so how i can synchronize pic RTC to computer.i have one computer application ...\n" + " </div>\n\n" + " <div class=\"tags t-microcontroller t-pic t-rtc\">\n" + " <a href=\"/questions/tagged/microcontroller\" class=\"post-tag\" title=\"show questions tagged 'microcontroller'\" rel=\"tag\">microcontroller</a> <a href=\"/questions/tagged/pic\" class=\"post-tag\" title=\"show questions tagged 'pic'\" rel=\"tag\">pic</a> <a href=\"/questions/tagged/rtc\" class=\"post-tag\" title=\"show questions tagged 'rtc'\" rel=\"tag\">rtc</a>\n\n" + " </div>\n" + " <div class=\"started fr\">\n\n\n" + " <div class=\"user-info \">\n" + " <div class=\"user-action-time\">\n\n\n" + " asked <span title=\"2013-08-08 08:52:58Z\" class=\"relativetime\">Aug 8 at 8:52</span>\n" + " </div>\n" + " <div class=\"user-gravatar32\">\n" + " <a href=\"/users/23841/shail-korat\"><div class=\"\"><img src=\"https://www.gravatar.com/avatar/649adca335821feacbd54299440806f2?s=32&d=identicon&r=PG\" alt=\"\" width=\"32\" height=\"32\"></div></a>\n" + " </div>\n" + " <div class=\"user-details\">\n" + " <a href=\"/users/23841/shail-korat\">shail korat</a><br>\n" + " <span class=\"reputation-score\" title=\"reputation score\" dir=\"ltr\">23</span><span title=\"6 bronze badges\"><span class=\"badge3\"></span><span class=\"badgecount\">6</span></span>\n" + " </div>\n" + " </div>\n\n" + " </div>\n" + " </div>\n" + "</div>\n\n" + "<div class=\"question-summary\" id=\"question-summary-78353\">\n" + " <div class=\"statscontainer\">\n" + " <div class=\"statsarrow\"></div>\n" + " <div class=\"stats\">\n" + " <div class=\"vote\">\n" + " <div class=\"votes\">\n" + " <span class=\"vote-count-post \"><strong>1</strong></span>\n" + " <div class=\"viewcount\">vote</div>\n" + " </div>\n" + " </div>\n" + " <div class=\"status answered-accepted\">\n" + " <strong>1</strong>answer\n" + " </div>\n" + " </div>\n\n\n\n" + "<div class=\"views \" title=\"46 views\">\n" + " 46 views\n" + "</div>\n" + " </div>\n" + " <div class=\"summary\">\n" + " <h3><a href=\"/questions/78353/spi-interfacing-using-serial-port-or-usb\" class=\"question-hyperlink\">SPI Interfacing using Serial Port or USB</a></h3>\n" + " <div class=\"excerpt\">\n" + " I have a nRF24L01+ module from Nordic Semiconductors. It has SPI interface. My laptop has USB ports and I have a Serial Port (Using a USB-to-Serial_Port adapter). What is the best possible solution to ...\n" + " </div>\n\n" + " <div class=\"tags t-usb t-serial t-spi t-interface\">\n" + " <a href=\"/questions/tagged/usb\" class=\"post-tag\" title=\"show questions tagged 'usb'\" rel=\"tag\">usb</a> <a href=\"/questions/tagged/serial\" class=\"post-tag\" title=\"show questions tagged 'serial'\" rel=\"tag\">serial</a> <a href=\"/questions/tagged/spi\" class=\"post-tag\" title=\"show questions tagged 'spi'\" rel=\"tag\">spi</a> <a href=\"/questions/tagged/interface\" class=\"post-tag\" title=\"show questions tagged 'interface'\" rel=\"tag\">interface</a>\n\n" + " </div>\n" + " <div class=\"started fr\">\n\n\n" + " <div class=\"user-info \">\n" + " <div class=\"user-action-time\">\n\n\n" + " asked <span title=\"2013-08-08 08:32:08Z\" class=\"relativetime\">Aug 8 at 8:32</span>\n" + " </div>\n" + " <div class=\"user-gravatar32\">\n" + " <a href=\"/users/7329/subin-sebastian\"><div class=\"\"><img src=\"https://www.gravatar.com/avatar/b3b512420352799f21d1e7933b59b9ed?s=32&d=identicon&r=PG\" alt=\"\" width=\"32\" height=\"32\"></div></a>\n" + " </div>\n" + " <div class=\"user-details\">\n" + " <a href=\"/users/7329/subin-sebastian\">Subin Sebastian</a><br>\n" + " <span class=\"reputation-score\" title=\"reputation score\" dir=\"ltr\">211</span><span title=\"1 silver badge\"><span class=\"badge2\"></span><span class=\"badgecount\">1</span></span><span title=\"7 bronze badges\"><span class=\"badge3\"></span><span class=\"badgecount\">7</span></span>\n" + " </div>\n" + " </div>\n\n" + " </div>\n" + " </div>\n" + "</div>\n\n" + "<div class=\"question-summary\" id=\"question-summary-78351\">\n" + " <div class=\"statscontainer\">\n" + " <div class=\"statsarrow\"></div>\n" + " <div class=\"stats\">\n" + " <div class=\"vote\">\n" + " <div class=\"votes\">\n" + " <span class=\"vote-count-post \"><strong>2</strong></span>\n" + " <div class=\"viewcount\">votes</div>\n" + " </div>\n" + " </div>\n" + " <div class=\"status answered-accepted\">\n" + " <strong>2</strong>answers\n" + " </div>\n" + " </div>\n\n\n\n" + "<div class=\"views \" title=\"54 views\">\n" + " 54 views\n" + "</div>\n" + " </div>\n" + " <div class=\"summary\">\n" + " <h3><a href=\"/questions/78351/trouble-on-understanding-alu-2-bit-design\" class=\"question-hyperlink\">Trouble on understanding ALU 2-bit design</a></h3>\n" + " <div class=\"excerpt\">\n" + " I'm new to this site and I'm pretty \"noobish\" to electrical engineering coming from a software engineering background I was hoping someone could help me understand this design a bit. I've highlighted ...\n" + " </div>\n\n" + " <div class=\"tags t-alu\">\n" + " <a href=\"/questions/tagged/alu\" class=\"post-tag\" title=\"show questions tagged 'alu'\" rel=\"tag\">alu</a>\n\n" + " </div>\n" + " <div class=\"started fr\">\n\n\n" + " <div class=\"user-info \">\n" + " <div class=\"user-action-time\">\n\n\n" + " asked <span title=\"2013-08-08 08:20:46Z\" class=\"relativetime\">Aug 8 at 8:20</span>\n" + " </div>\n" + " <div class=\"user-gravatar32\">\n" + " <a href=\"/users/27251/thecodemonsters\"><div class=\"\"><img src=\"https://www.gravatar.com/avatar/b02a007bf995a0986bd3c55d6b5bc3e6?s=32&d=identicon&r=PG\" alt=\"\" width=\"32\" height=\"32\"></div></a>\n" + " </div>\n" + " <div class=\"user-details\">\n" + " <a href=\"/users/27251/thecodemonsters\">theCodeMonsters</a><br>\n" + " <span class=\"reputation-score\" title=\"reputation score\" dir=\"ltr\">13</span><span title=\"2 bronze badges\"><span class=\"badge3\"></span><span class=\"badgecount\">2</span></span>\n" + " </div>\n" + " </div>\n\n" + " </div>\n" + " </div>\n" + "</div>\n\n" + "<div class=\"question-summary\" id=\"question-summary-78348\">\n" + " <div class=\"statscontainer\">\n" + " <div class=\"statsarrow\"></div>\n" + " <div class=\"stats\">\n" + " <div class=\"vote\">\n" + " <div class=\"votes\">\n" + " <span class=\"vote-count-post \"><strong>3</strong></span>\n" + " <div class=\"viewcount\">votes</div>\n" + " </div>\n" + " </div>\n" + " <div class=\"status answered\">\n" + " <strong>1</strong>answer\n" + " </div>\n" + " </div>\n\n\n\n" + "<div class=\"views \" title=\"57 views\">\n" + " 57 views\n" + "</div>\n" + " </div>\n" + " <div class=\"summary\">\n" + " <h3><a href=\"/questions/78348/small-max-5x5-mm-connector-panel-mount-for-asyncronous-serial-interface\" class=\"question-hyperlink\">Small (max 5x5 mm) connector, panel mount, for asyncronous serial interface?</a></h3>\n" + " <div class=\"excerpt\">\n" + " I opened a small router and hooked up 2 wires on the PCB (to catch the serial data). That works fine.\n\n" + "Now I'm looking for a way to make a small (tiny) connector in the enclosure, so for future use i ...\n" + " </div>\n\n" + " <div class=\"tags t-pcb t-connector t-cases t-mount\">\n" + " <a href=\"/questions/tagged/pcb\" class=\"post-tag\" title=\"show questions tagged 'pcb'\" rel=\"tag\">pcb</a> <a href=\"/questions/tagged/connector\" class=\"post-tag\" title=\"show questions tagged 'connector'\" rel=\"tag\">connector</a> <a href=\"/questions/tagged/cases\" class=\"post-tag\" title=\"show questions tagged 'cases'\" rel=\"tag\">cases</a> <a href=\"/questions/tagged/mount\" class=\"post-tag\" title=\"show questions tagged 'mount'\" rel=\"tag\">mount</a>\n\n" + " </div>\n" + " <div class=\"started fr\">\n\n\n" + " <div class=\"user-info \">\n" + " <div class=\"user-action-time\">\n\n\n" + " asked <span title=\"2013-08-08 07:20:56Z\" class=\"relativetime\">Aug 8 at 7:20</span>\n" + " </div>\n" + " <div class=\"user-gravatar32\">\n" + " <a href=\"/users/8524/rogier\"><div class=\"\"><img src=\"https://www.gravatar.com/avatar/181219cd20b8036ef8ec45b94aed6474?s=32&d=identicon&r=PG\" alt=\"\" width=\"32\" height=\"32\"></div></a>\n" + " </div>\n" + " <div class=\"user-details\">\n" + " <a href=\"/users/8524/rogier\">Rogier</a><br>\n" + " <span class=\"reputation-score\" title=\"reputation score\" dir=\"ltr\">165</span><span title=\"6 bronze badges\"><span class=\"badge3\"></span><span class=\"badgecount\">6</span></span>\n" + " </div>\n" + " </div>\n\n" + " </div>\n" + " </div>\n" + "</div>\n\n" + "<div class=\"question-summary\" id=\"question-summary-78345\">\n" + " <div class=\"statscontainer\">\n" + " <div class=\"statsarrow\"></div>\n" + " <div class=\"stats\">\n" + " <div class=\"vote\">\n" + " <div class=\"votes\">\n" + " <span class=\"vote-count-post \"><strong>4</strong></span>\n" + " <div class=\"viewcount\">votes</div>\n" + " </div>\n" + " </div>\n" + " <div class=\"status answered-accepted\">\n" + " <strong>1</strong>answer\n" + " </div>\n" + " </div>\n\n\n\n" + "<div class=\"views \" title=\"69 views\">\n" + " 69 views\n" + "</div>\n" + " </div>\n" + " <div class=\"summary\">\n" + " <h3><a href=\"/questions/78345/what-happened-to-the-to-3-package\" class=\"question-hyperlink\">What happened to the TO-3 package?</a></h3>\n" + " <div class=\"excerpt\">\n" + " TO-3 used to be a common package for power transistors, but you don't see them much anymore. It can't be just because of SMT, TO-220 is still much in use. TO-3 has a much lower thermal resistance than ...\n" + " </div>\n\n" + " <div class=\"tags t-packages\">\n" + " <a href=\"/questions/tagged/packages\" class=\"post-tag\" title=\"show questions tagged 'packages'\" rel=\"tag\">packages</a>\n\n" + " </div>\n" + " <div class=\"started fr\">\n\n\n" + " <div class=\"user-info \">\n" + " <div class=\"user-action-time\">\n\n\n" + " asked <span title=\"2013-08-08 07:05:21Z\" class=\"relativetime\">Aug 8 at 7:05</span>\n" + " </div>\n" + " <div class=\"user-gravatar32\">\n" + " <a href=\"/users/27167/radagast\"><div class=\"\"><img src=\"https://www.gravatar.com/avatar/294b3e797acb485f50878567a54bfec8?s=32&d=identicon&r=PG\" alt=\"\" width=\"32\" height=\"32\"></div></a>\n" + " </div>\n" + " <div class=\"user-details\">\n" + " <a href=\"/users/27167/radagast\">radagast</a><br>\n" + " <span class=\"reputation-score\" title=\"reputation score\" dir=\"ltr\">334</span><span title=\"1 silver badge\"><span class=\"badge2\"></span><span class=\"badgecount\">1</span></span><span title=\"11 bronze badges\"><span class=\"badge3\"></span><span class=\"badgecount\">11</span></span>\n" + " </div>\n" + " </div>\n\n" + " </div>\n" + " </div>\n" + "</div>\n\n" + "<div class=\"question-summary\" id=\"question-summary-78337\">\n" + " <div class=\"statscontainer\">\n" + " <div class=\"statsarrow\"></div>\n" + " <div class=\"stats\">\n" + " <div class=\"vote\">\n" + " <div class=\"votes\">\n" + " <span class=\"vote-count-post \"><strong>16</strong></span>\n" + " <div class=\"viewcount\">votes</div>\n" + " </div>\n" + " </div>\n" + " <div class=\"status answered-accepted\">\n" + " <strong>2</strong>answers\n" + " </div>\n" + " </div>\n\n\n\n" + "<div class=\"views \" title=\"431 views\">\n" + " 431 views\n" + "</div>\n" + " </div>\n" + " <div class=\"summary\">\n" + " <h3><a href=\"/questions/78337/which-way-does-electricity-power-a-circuit\" class=\"question-hyperlink\">Which way does electricity power a circuit?</a></h3>\n" + " <div class=\"excerpt\">\n" + " Working with some circuits this summer, I ran into what everyone eventually does: Current flows from + to - despite the electrons flowing (well, bumping into eachother) from - to +. I understand the ...\n" + " </div>\n\n" + " <div class=\"tags t-power-supply t-current t-analog\">\n" + " <a href=\"/questions/tagged/power-supply\" class=\"post-tag\" title=\"show questions tagged 'power-supply'\" rel=\"tag\">power-supply</a> <a href=\"/questions/tagged/current\" class=\"post-tag\" title=\"show questions tagged 'current'\" rel=\"tag\">current</a> <a href=\"/questions/tagged/analog\" class=\"post-tag\" title=\"show questions tagged 'analog'\" rel=\"tag\">analog</a>\n\n" + " </div>\n" + " <div class=\"started fr\">\n\n\n" + " <div class=\"user-info \">\n" + " <div class=\"user-action-time\">\n\n\n" + " asked <span title=\"2013-08-08 04:00:29Z\" class=\"relativetime\">Aug 8 at 4:00</span>\n" + " </div>\n" + " <div class=\"user-gravatar32\">\n" + " <a href=\"/users/27243/tom\"><div class=\"\"><img src=\"https://www.gravatar.com/avatar/bfc2bcb561dd6949178afc5306c1fb25?s=32&d=identicon&r=PG\" alt=\"\" width=\"32\" height=\"32\"></div></a>\n" + " </div>\n" + " <div class=\"user-details\">\n" + " <a href=\"/users/27243/tom\">Tom</a><br>\n" + " <span class=\"reputation-score\" title=\"reputation score\" dir=\"ltr\">81</span><span title=\"4 bronze badges\"><span class=\"badge3\"></span><span class=\"badgecount\">4</span></span>\n" + " </div>\n" + " </div>\n\n" + " </div>\n" + " </div>\n" + "</div>\n\n" + "<div class=\"question-summary\" id=\"question-summary-78336\">\n" + " <div class=\"statscontainer\">\n" + " <div class=\"statsarrow\"></div>\n" + " <div class=\"stats\">\n" + " <div class=\"vote\">\n" + " <div class=\"votes\">\n" + " <span class=\"vote-count-post \"><strong>1</strong></span>\n" + " <div class=\"viewcount\">vote</div>\n" + " </div>\n" + " </div>\n" + " <div class=\"status answered\">\n" + " <strong>2</strong>answers\n" + " </div>\n" + " </div>\n\n\n\n" + "<div class=\"views \" title=\"115 views\">\n" + " 115 views\n" + "</div>\n" + " </div>\n" + " <div class=\"summary\">\n" + " <h3><a href=\"/questions/78336/using-relay-with-microcontroller\" class=\"question-hyperlink\">Using Relay With Microcontroller</a></h3>\n" + " <div class=\"excerpt\">\n" + " I have created a boost converter which boost 12v to 60v. I want to be able to pulse this voltage under water. I would like to have only the positive lead (Vout from boost) to come off the boost ...\n" + " </div>\n\n" + " <div class=\"tags t-microcontroller t-relay\">\n" + " <a href=\"/questions/tagged/microcontroller\" class=\"post-tag\" title=\"show questions tagged 'microcontroller'\" rel=\"tag\">microcontroller</a> <a href=\"/questions/tagged/relay\" class=\"post-tag\" title=\"show questions tagged 'relay'\" rel=\"tag\">relay</a>\n\n" + " </div>\n" + " <div class=\"started fr\">\n\n\n" + " <div class=\"user-info \">\n" + " <div class=\"user-action-time\">\n\n\n" + " asked <span title=\"2013-08-08 03:56:44Z\" class=\"relativetime\">Aug 8 at 3:56</span>\n" + " </div>\n" + " <div class=\"user-gravatar32\">\n" + " <a href=\"/users/27242/wallace\"><div class=\"\"><img src=\"https://www.gravatar.com/avatar/ea5a17f0b7d6efa25f118ade0a0db9d5?s=32&d=identicon&r=PG\" alt=\"\" width=\"32\" height=\"32\"></div></a>\n" + " </div>\n" + " <div class=\"user-details\">\n" + " <a href=\"/users/27242/wallace\">Wallace</a><br>\n" + " <span class=\"reputation-score\" title=\"reputation score\" dir=\"ltr\">58</span><span title=\"7 bronze badges\"><span class=\"badge3\"></span><span class=\"badgecount\">7</span></span>\n" + " </div>\n" + " </div>\n\n" + " </div>\n" + " </div>\n" + "</div>\n\n" + "<div class=\"question-summary\" id=\"question-summary-78329\">\n" + " <div class=\"statscontainer\">\n" + " <div class=\"statsarrow\"></div>\n" + " <div class=\"stats\">\n" + " <div class=\"vote\">\n" + " <div class=\"votes\">\n" + " <span class=\"vote-count-post \"><strong>0</strong></span>\n" + " <div class=\"viewcount\">votes</div>\n" + " </div>\n" + " </div>\n" + " <div class=\"status answered\">\n" + " <strong>2</strong>answers\n" + " </div>\n" + " </div>\n\n\n\n" + "<div class=\"views \" title=\"48 views\">\n" + " 48 views\n" + "</div>\n" + " </div>\n" + " <div class=\"summary\">\n" + " <h3><a href=\"/questions/78329/how-to-measure-the-current-from-ac-dc-supplier\" class=\"question-hyperlink\">how to measure the current from AC-DC supplier?</a></h3>\n" + " <div class=\"excerpt\">\n" + " I started to learn the AC/DC circuit some times ago. I don't have much experience. But from this semester on, I have some chances to practice it in lab by working on some project. I got a AC/DC power ...\n" + " </div>\n\n" + " <div class=\"tags t-power-supply t-dc\">\n" + " <a href=\"/questions/tagged/power-supply\" class=\"post-tag\" title=\"show questions tagged 'power-supply'\" rel=\"tag\">power-supply</a> <a href=\"/questions/tagged/dc\" class=\"post-tag\" title=\"show questions tagged 'dc'\" rel=\"tag\">dc</a>\n\n" + " </div>\n" + " <div class=\"started fr\">\n\n\n" + " <div class=\"user-info \">\n" + " <div class=\"user-action-time\">\n\n\n" + " asked <span title=\"2013-08-08 02:05:53Z\" class=\"relativetime\">Aug 8 at 2:05</span>\n" + " </div>\n" + " <div class=\"user-gravatar32\">\n" + " <a href=\"/users/17060/user1285419\"><div class=\"\"><img src=\"https://www.gravatar.com/avatar/08ee68b20a4eceff26f7eee99b708c08?s=32&d=identicon&r=PG\" alt=\"\" width=\"32\" height=\"32\"></div></a>\n" + " </div>\n" + " <div class=\"user-details\">\n" + " <a href=\"/users/17060/user1285419\">user1285419</a><br>\n" + " <span class=\"reputation-score\" title=\"reputation score\" dir=\"ltr\">165</span><span title=\"5 bronze badges\"><span class=\"badge3\"></span><span class=\"badgecount\">5</span></span>\n" + " </div>\n" + " </div>\n\n" + " </div>\n" + " </div>\n" + "</div>\n\n" + "<div class=\"question-summary\" id=\"question-summary-78328\">\n" + " <div class=\"statscontainer\">\n" + " <div class=\"statsarrow\"></div>\n" + " <div class=\"stats\">\n" + " <div class=\"vote\">\n" + " <div class=\"votes\">\n" + " <span class=\"vote-count-post \"><strong>0</strong></span>\n" + " <div class=\"viewcount\">votes</div>\n" + " </div>\n" + " </div>\n" + " <div class=\"status answered\">\n" + " <strong>1</strong>answer\n" + " </div>\n" + " </div>\n\n\n\n" + "<div class=\"views \" title=\"86 views\">\n" + " 86 views\n" + "</div>\n" + " </div>\n" + " <div class=\"summary\">\n" + " <h3><a href=\"/questions/78328/reducing-capacitance-of-a-wire\" class=\"question-hyperlink\">Reducing capacitance of a wire</a></h3>\n" + " <div class=\"excerpt\">\n" + " Given a wire and a piece of foil wired to a bread board, is it possible using capacitors wired in series (or some other method) to significantly reduce the capacitance of the wire/foil?\n\n" + " </div>\n\n" + " <div class=\"tags t-capacitor t-capacitance\">\n" + " <a href=\"/questions/tagged/capacitor\" class=\"post-tag\" title=\"show questions tagged 'capacitor'\" rel=\"tag\">capacitor</a> <a href=\"/questions/tagged/capacitance\" class=\"post-tag\" title=\"show questions tagged 'capacitance'\" rel=\"tag\">capacitance</a>\n\n" + " </div>\n" + " <div class=\"started fr\">\n\n\n" + " <div class=\"user-info \">\n" + " <div class=\"user-action-time\">\n\n\n" + " asked <span title=\"2013-08-08 02:03:19Z\" class=\"relativetime\">Aug 8 at 2:03</span>\n" + " </div>\n" + " <div class=\"user-gravatar32\">\n" + " <a href=\"/users/27085/j03m\"><div class=\"\"><img src=\"https://www.gravatar.com/avatar/a16354f806a5e7cdf68128173ec06ec6?s=32&d=identicon&r=PG\" alt=\"\" width=\"32\" height=\"32\"></div></a>\n" + " </div>\n" + " <div class=\"user-details\">\n" + " <a href=\"/users/27085/j03m\">j03m</a><br>\n" + " <span class=\"reputation-score\" title=\"reputation score\" dir=\"ltr\">146</span><span title=\"4 bronze badges\"><span class=\"badge3\"></span><span class=\"badgecount\">4</span></span>\n" + " </div>\n" + " </div>\n\n" + " </div>\n" + " </div>\n" + "</div>\n\n" + "<div class=\"question-summary\" id=\"question-summary-78322\">\n" + " <div class=\"statscontainer\">\n" + " <div class=\"statsarrow\"></div>\n" + " <div class=\"stats\">\n" + " <div class=\"vote\">\n" + " <div class=\"votes\">\n" + " <span class=\"vote-count-post \"><strong>-2</strong></span>\n" + " <div class=\"viewcount\">votes</div>\n" + " </div>\n" + " </div>\n" + " <div class=\"status answered-accepted\">\n" + " <strong>1</strong>answer\n" + " </div>\n" + " </div>\n\n\n\n" + "<div class=\"views \" title=\"63 views\">\n" + " 63 views\n" + "</div>\n" + " </div>\n" + " <div class=\"summary\">\n" + " <h3><a href=\"/questions/78322/ground-wire-installation\" class=\"question-hyperlink\">Ground Wire Installation [closed]</a></h3>\n" + " <div class=\"excerpt\">\n" + " Currently I do not have ground in my house wiring. I am planing to install ground wiring but the floor around the main service panel is cemented and I don't think I can place a ground rod in the ...\n" + " </div>\n\n" + " <div class=\"tags t-wiring\">\n" + " <a href=\"/questions/tagged/wiring\" class=\"post-tag\" title=\"show questions tagged 'wiring'\" rel=\"tag\">wiring</a>\n\n" + " </div>\n" + " <div class=\"started fr\">\n\n\n" + " <div class=\"user-info \">\n" + " <div class=\"user-action-time\">\n\n\n" + " asked <span title=\"2013-08-08 00:38:13Z\" class=\"relativetime\">Aug 8 at 0:38</span>\n" + " </div>\n" + " <div class=\"user-gravatar32\">\n" + " <a href=\"/users/27238/khiz\"><div class=\"\"><img src=\"https://www.gravatar.com/avatar/5a94e8f9238c314cab95243f99332222?s=32&d=identicon&r=PG\" alt=\"\" width=\"32\" height=\"32\"></div></a>\n" + " </div>\n" + " <div class=\"user-details\">\n" + " <a href=\"/users/27238/khiz\">khiz</a><br>\n" + " <span class=\"reputation-score\" title=\"reputation score\" dir=\"ltr\">33</span><span title=\"3 bronze badges\"><span class=\"badge3\"></span><span class=\"badgecount\">3</span></span>\n" + " </div>\n" + " </div>\n\n" + " </div>\n" + " </div>\n" + "</div>\n\n" + "<div class=\"question-summary\" id=\"question-summary-78319\">\n" + " <div class=\"statscontainer\">\n" + " <div class=\"statsarrow\"></div>\n" + " <div class=\"stats\">\n" + " <div class=\"vote\">\n" + " <div class=\"votes\">\n" + " <span class=\"vote-count-post \"><strong>1</strong></span>\n" + " <div class=\"viewcount\">vote</div>\n" + " </div>\n" + " </div>\n" + " <div class=\"status answered\">\n" + " <strong>2</strong>answers\n" + " </div>\n" + " </div>\n\n\n\n" + "<div class=\"views \" title=\"63 views\">\n" + " 63 views\n" + "</div>\n" + " </div>\n" + " <div class=\"summary\">\n" + " <h3><a href=\"/questions/78319/performance-of-solar-panel-vs-dc-power-supply\" class=\"question-hyperlink\">Performance of solar panel vs. DC power supply</a></h3>\n" + " <div class=\"excerpt\">\n" + " I am building a solar swamp cooler for burning man (hot dry desert environment).\n\n" + "Purchased a 15w solar panel that outputs 0.9a at 20V in full sun (verified as true with my voltmeter). The solar panel ...\n" + " </div>\n\n" + " <div class=\"tags t-power-supply t-dc t-solar-cell\">\n" + " <a href=\"/questions/tagged/power-supply\" class=\"post-tag\" title=\"show questions tagged 'power-supply'\" rel=\"tag\">power-supply</a> <a href=\"/questions/tagged/dc\" class=\"post-tag\" title=\"show questions tagged 'dc'\" rel=\"tag\">dc</a> <a href=\"/questions/tagged/solar-cell\" class=\"post-tag\" title=\"show questions tagged 'solar-cell'\" rel=\"tag\">solar-cell</a>\n\n" + " </div>\n" + " <div class=\"started fr\">\n\n\n" + " <div class=\"user-info \">\n" + " <div class=\"user-action-time\">\n\n\n" + " asked <span title=\"2013-08-08 00:07:34Z\" class=\"relativetime\">Aug 8 at 0:07</span>\n" + " </div>\n" + " <div class=\"user-gravatar32\">\n" + " <a href=\"/users/27183/nimble\"><div class=\"\"><img src=\"https://www.gravatar.com/avatar/2bb088aedd0b5458b587e3bc104f1edc?s=32&d=identicon&r=PG\" alt=\"\" width=\"32\" height=\"32\"></div></a>\n" + " </div>\n" + " <div class=\"user-details\">\n" + " <a href=\"/users/27183/nimble\">nimble</a><br>\n" + " <span class=\"reputation-score\" title=\"reputation score\" dir=\"ltr\">11</span><span title=\"1 bronze badge\"><span class=\"badge3\"></span><span class=\"badgecount\">1</span></span>\n" + " </div>\n" + " </div>\n\n" + " </div>\n" + " </div>\n" + "</div>\n\n" + "<div class=\"question-summary\" id=\"question-summary-78318\">\n" + " <div class=\"statscontainer\">\n" + " <div class=\"statsarrow\"></div>\n" + " <div class=\"stats\">\n" + " <div class=\"vote\">\n" + " <div class=\"votes\">\n" + " <span class=\"vote-count-post \"><strong>0</strong></span>\n" + " <div class=\"viewcount\">votes</div>\n" + " </div>\n" + " </div>\n" + " <div class=\"status unanswered\">\n" + " <strong>0</strong>answers\n" + " </div>\n" + " </div>\n\n\n\n" + "<div class=\"views \" title=\"23 views\">\n" + " 23 views\n" + "</div>\n" + " </div>\n" + " <div class=\"summary\">\n" + " <h3><a href=\"/questions/78318/altium-simulation-node-voltages\" class=\"question-hyperlink\">Altium Simulation Node Voltages</a></h3>\n" + " <div class=\"excerpt\">\n" + " When simulating a circuit in Altium it generates signals based on the components and net labels placed in the circuit, eg:\n\n" + "<span class='tex2jax_ignore'>r1[i]\n" + "r1[p]\n" + "v1\n" + "v2\n" + "</span>\n\n" + "Altium also adds the ...\n" + " </div>\n\n" + " <div class=\"tags t-simulation t-circuit-analysis t-altium\">\n" + " <a href=\"/questions/tagged/simulation\" class=\"post-tag\" title=\"show questions tagged 'simulation'\" rel=\"tag\">simulation</a> <a href=\"/questions/tagged/circuit-analysis\" class=\"post-tag\" title=\"show questions tagged 'circuit-analysis'\" rel=\"tag\">circuit-analysis</a> <a href=\"/questions/tagged/altium\" class=\"post-tag\" title=\"show questions tagged 'altium'\" rel=\"tag\">altium</a>\n\n" + " </div>\n" + " <div class=\"started fr\">\n\n\n" + " <div class=\"user-info \">\n" + " <div class=\"user-action-time\">\n\n\n" + " asked <span title=\"2013-08-07 23:55:41Z\" class=\"relativetime\">Aug 7 at 23:55</span>\n" + " </div>\n" + " <div class=\"user-gravatar32\">\n" + " <a href=\"/users/27237/troy\"><div class=\"\"><img src=\"https://www.gravatar.com/avatar/5c9a9c526c1c796a536814e3b04405d1?s=32&d=identicon&r=PG\" alt=\"\" width=\"32\" height=\"32\"></div></a>\n" + " </div>\n" + " <div class=\"user-details\">\n" + " <a href=\"/users/27237/troy\">Troy</a><br>\n" + " <span class=\"reputation-score\" title=\"reputation score\" dir=\"ltr\">1</span><span title=\"1 bronze badge\"><span class=\"badge3\"></span><span class=\"badgecount\">1</span></span>\n" + " </div>\n" + " </div>\n\n" + " </div>\n" + " </div>\n" + "</div>\n\n" + "<div class=\"question-summary\" id=\"question-summary-78315\">\n" + " <div class=\"statscontainer\">\n" + " <div class=\"statsarrow\"></div>\n" + " <div class=\"stats\">\n" + " <div class=\"vote\">\n" + " <div class=\"votes\">\n" + " <span class=\"vote-count-post \"><strong>1</strong></span>\n" + " <div class=\"viewcount\">vote</div>\n" + " </div>\n" + " </div>\n" + " <div class=\"status answered-accepted\">\n" + " <strong>2</strong>answers\n" + " </div>\n" + " </div>\n\n\n\n" + "<div class=\"views \" title=\"146 views\">\n" + " 146 views\n" + "</div>\n" + " </div>\n" + " <div class=\"summary\">\n" + " <h3><a href=\"/questions/78315/why-does-the-voltage-changes-in-this-simple-circuit\" class=\"question-hyperlink\">Why does the voltage changes in this simple circuit?</a></h3>\n" + " <div class=\"excerpt\">\n" + " I'm beginning to learn electronics, and there's something I just can't grasp. I was told that a high resistance in a circuit would lead to a smaller current passing through it, but the voltage would ...\n" + " </div>\n\n" + " <div class=\"tags t-power t-voltage t-current t-resistance t-ohms-law\">\n" + " <a href=\"/questions/tagged/power\" class=\"post-tag\" title=\"show questions tagged 'power'\" rel=\"tag\">power</a> <a href=\"/questions/tagged/voltage\" class=\"post-tag\" title=\"show questions tagged 'voltage'\" rel=\"tag\">voltage</a> <a href=\"/questions/tagged/current\" class=\"post-tag\" title=\"show questions tagged 'current'\" rel=\"tag\">current</a> <a href=\"/questions/tagged/resistance\" class=\"post-tag\" title=\"show questions tagged 'resistance'\" rel=\"tag\">resistance</a> <a href=\"/questions/tagged/ohms-law\" class=\"post-tag\" title=\"show questions tagged 'ohms-law'\" rel=\"tag\">ohms-law</a>\n\n" + " </div>\n" + " <div class=\"started fr\">\n\n\n" + " <div class=\"user-info \">\n" + " <div class=\"user-action-time\">\n\n\n" + " asked <span title=\"2013-08-07 23:08:48Z\" class=\"relativetime\">Aug 7 at 23:08</span>\n" + " </div>\n" + " <div class=\"user-gravatar32\">\n" + " <a href=\"/users/27236/wingleader\"><div class=\"\"><img src=\"https://www.gravatar.com/avatar/01d2f745e0e93e81d23ca4214668eadb?s=32&d=identicon&r=PG\" alt=\"\" width=\"32\" height=\"32\"></div></a>\n" + " </div>\n" + " <div class=\"user-details\">\n" + " <a href=\"/users/27236/wingleader\">wingleader</a><br>\n" + " <span class=\"reputation-score\" title=\"reputation score\" dir=\"ltr\">8</span><span title=\"2 bronze badges\"><span class=\"badge3\"></span><span class=\"badgecount\">2</span></span>\n" + " </div>\n" + " </div>\n\n" + " </div>\n" + " </div>\n" + "</div>\n\n" + "<div class=\"question-summary\" id=\"question-summary-78307\">\n" + " <div class=\"statscontainer\">\n" + " <div class=\"statsarrow\"></div>\n" + " <div class=\"stats\">\n" + " <div class=\"vote\">\n" + " <div class=\"votes\">\n" + " <span class=\"vote-count-post \"><strong>-1</strong></span>\n" + " <div class=\"viewcount\">votes</div>\n" + " </div>\n" + " </div>\n" + " <div class=\"status answered-accepted\">\n" + " <strong>4</strong>answers\n" + " </div>\n" + " </div>\n\n\n\n" + "<div class=\"views \" title=\"89 views\">\n" + " 89 views\n" + "</div>\n" + " </div>\n" + " <div class=\"summary\">\n" + " <h3><a href=\"/questions/78307/how-do-i-figure-out-the-correct-polarity-of-a-dc-barrel-connector\" class=\"question-hyperlink\">How do I figure out the correct polarity of a DC barrel connector</a></h3>\n" + " <div class=\"excerpt\">\n" + " I'm in the U.S. and I bought a digital wall clock from the U.K. which came with an AC adapter with input 230V/50Hz/90mA and output 9V/800mA. Now I could get a transformer to convert 120V to 230V but ...\n" + " </div>\n\n" + " <div class=\"tags t-multimeter t-polarity\">\n" + " <a href=\"/questions/tagged/multimeter\" class=\"post-tag\" title=\"show questions tagged 'multimeter'\" rel=\"tag\">multimeter</a> <a href=\"/questions/tagged/polarity\" class=\"post-tag\" title=\"show questions tagged 'polarity'\" rel=\"tag\">polarity</a>\n\n" + " </div>\n" + " <div class=\"started fr\">\n\n\n" + " <div class=\"user-info \">\n" + " <div class=\"user-action-time\">\n\n\n" + " asked <span title=\"2013-08-07 21:38:15Z\" class=\"relativetime\">Aug 7 at 21:38</span>\n" + " </div>\n" + " <div class=\"user-gravatar32\">\n" + " <a href=\"/users/27233/eydelber\"><div class=\"\"><img src=\"https://www.gravatar.com/avatar/f882365e2a203587fe941634b3a376b2?s=32&d=identicon&r=PG\" alt=\"\" width=\"32\" height=\"32\"></div></a>\n" + " </div>\n" + " <div class=\"user-details\">\n" + " <a href=\"/users/27233/eydelber\">eydelber</a><br>\n" + " <span class=\"reputation-score\" title=\"reputation score\" dir=\"ltr\">101</span><span title=\"4 bronze badges\"><span class=\"badge3\"></span><span class=\"badgecount\">4</span></span>\n" + " </div>\n" + " </div>\n\n" + " </div>\n" + " </div>\n" + "</div>\n" + " </div>\n\n" + " <br class=\"cbt\">\n\n\n" + " <div class=\"page-sizer fr\">\n" + " <a href=\"/questions?pagesize=15&amp;sort=newest\" title=\"show 15 items per page\" class=\"page-numbers current\">15</a>\n" + " <a href=\"/questions?pagesize=30&amp;sort=newest\" title=\"show 30 items per page\" class=\"page-numbers \">30</a>\n" + " <a href=\"/questions?pagesize=50&amp;sort=newest\" title=\"show 50 items per page\" class=\"page-numbers \">50</a>\n" + " <span class=\"page-numbers desc\">per page</span>\n" + " </div>\n" + "<div class=\"pager fl\" >\n" + "<a href=\"/questions?page=43&amp;sort=newest\" title=\"go to page 43\" rel=\"prev\"><span class=\"page-numbers prev\">prev </span></a>\n" + "<a 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next\"> next</span></a>\n" + "</div>\n\n" + "</div>\n" + "<div id=\"sidebar\">\n" + " <div class=\"module\" id=\"questions-count\">\n" + " <div class=\"summarycount al\">20,098</div>\n" + " <p>questions</p>\n" + " </div>\n\n\n\n\n\n\n\n" + " <div class=\"module\" id=\"related-tags\">\n" + " <h4 id=\"h-related-tags\">Related Tags</h4>\n\n" + " <a href=\"/questions/tagged/arduino\" class=\"post-tag\" title=\"show questions tagged 'arduino'\" rel=\"tag\">arduino</a>&nbsp;<span class=\"item-multiplier\"><span class=\"item-multiplier-x\">&times;</span>&nbsp;<span class=\"item-multiplier-count\">2030</span></span><br>\n" + " <a href=\"/questions/tagged/microcontroller\" class=\"post-tag\" title=\"show questions tagged 'microcontroller'\" rel=\"tag\">microcontroller</a>&nbsp;<span class=\"item-multiplier\"><span class=\"item-multiplier-x\">&times;</span>&nbsp;<span class=\"item-multiplier-count\">1432</span></span><br>\n" + " <a href=\"/questions/tagged/power-supply\" class=\"post-tag\" title=\"show questions tagged 'power-supply'\" rel=\"tag\">power-supply</a>&nbsp;<span class=\"item-multiplier\"><span class=\"item-multiplier-x\">&times;</span>&nbsp;<span class=\"item-multiplier-count\">899</span></span><br>\n" + " <a href=\"/questions/tagged/led\" class=\"post-tag\" title=\"show questions tagged 'led'\" rel=\"tag\">led</a>&nbsp;<span class=\"item-multiplier\"><span class=\"item-multiplier-x\">&times;</span>&nbsp;<span class=\"item-multiplier-count\">789</span></span><br>\n" + " <a href=\"/questions/tagged/pic\" class=\"post-tag\" title=\"show questions tagged 'pic'\" rel=\"tag\">pic</a>&nbsp;<span class=\"item-multiplier\"><span class=\"item-multiplier-x\">&times;</span>&nbsp;<span class=\"item-multiplier-count\">735</span></span><br>\n" + " <a href=\"/questions/tagged/power\" class=\"post-tag\" title=\"show questions tagged 'power'\" rel=\"tag\">power</a>&nbsp;<span class=\"item-multiplier\"><span class=\"item-multiplier-x\">&times;</span>&nbsp;<span class=\"item-multiplier-count\">730</span></span><br>\n" + " <a href=\"/questions/tagged/voltage\" class=\"post-tag\" title=\"show questions tagged 'voltage'\" rel=\"tag\">voltage</a>&nbsp;<span class=\"item-multiplier\"><span class=\"item-multiplier-x\">&times;</span>&nbsp;<span class=\"item-multiplier-count\">608</span></span><br>\n" + " <a href=\"/questions/tagged/batteries\" class=\"post-tag\" title=\"show questions tagged 'batteries'\" rel=\"tag\">batteries</a>&nbsp;<span class=\"item-multiplier\"><span class=\"item-multiplier-x\">&times;</span>&nbsp;<span class=\"item-multiplier-count\">593</span></span><br>\n" + " <a href=\"/questions/tagged/transistors\" class=\"post-tag\" title=\"show questions tagged 'transistors'\" rel=\"tag\">transistors</a>&nbsp;<span class=\"item-multiplier\"><span class=\"item-multiplier-x\">&times;</span>&nbsp;<span class=\"item-multiplier-count\">577</span></span><br>\n" + " <a href=\"/questions/tagged/pcb\" class=\"post-tag\" title=\"show questions 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rel=\"tag\">current</a>&nbsp;<span class=\"item-multiplier\"><span class=\"item-multiplier-x\">&times;</span>&nbsp;<span class=\"item-multiplier-count\">436</span></span><br>\n" + " <a href=\"/questions/tagged/fpga\" class=\"post-tag\" title=\"show questions tagged 'fpga'\" rel=\"tag\">fpga</a>&nbsp;<span class=\"item-multiplier\"><span class=\"item-multiplier-x\">&times;</span>&nbsp;<span class=\"item-multiplier-count\">431</span></span><br>\n" + " <a href=\"/questions/tagged/circuit\" class=\"post-tag\" title=\"show questions tagged 'circuit'\" rel=\"tag\">circuit</a>&nbsp;<span class=\"item-multiplier\"><span class=\"item-multiplier-x\">&times;</span>&nbsp;<span class=\"item-multiplier-count\">423</span></span><br>\n" + " <a href=\"/questions/tagged/resistors\" class=\"post-tag\" title=\"show questions tagged 'resistors'\" rel=\"tag\">resistors</a>&nbsp;<span class=\"item-multiplier\"><span class=\"item-multiplier-x\">&times;</span>&nbsp;<span class=\"item-multiplier-count\">394</span></span><br>\n" + " <a href=\"/questions/tagged/audio\" class=\"post-tag\" title=\"show questions tagged 'audio'\" rel=\"tag\">audio</a>&nbsp;<span class=\"item-multiplier\"><span class=\"item-multiplier-x\">&times;</span>&nbsp;<span class=\"item-multiplier-count\">394</span></span><br>\n" + " <a href=\"/questions/tagged/motor\" class=\"post-tag\" title=\"show questions tagged 'motor'\" rel=\"tag\">motor</a>&nbsp;<span class=\"item-multiplier\"><span class=\"item-multiplier-x\">&times;</span>&nbsp;<span class=\"item-multiplier-count\">384</span></span><br>\n" + " <a href=\"/questions/tagged/voltage-regulator\" class=\"post-tag\" title=\"show questions tagged 'voltage-regulator'\" rel=\"tag\">voltage-regulator</a>&nbsp;<span class=\"item-multiplier\"><span class=\"item-multiplier-x\">&times;</span>&nbsp;<span class=\"item-multiplier-count\">377</span></span><br>\n" + " <a href=\"/questions/tagged/mosfet\" class=\"post-tag\" title=\"show questions tagged 'mosfet'\" rel=\"tag\">mosfet</a>&nbsp;<span class=\"item-multiplier\"><span class=\"item-multiplier-x\">&times;</span>&nbsp;<span class=\"item-multiplier-count\">374</span></span><br>\n" + " <a href=\"/questions/tagged/switches\" class=\"post-tag\" title=\"show questions tagged 'switches'\" rel=\"tag\">switches</a>&nbsp;<span class=\"item-multiplier\"><span class=\"item-multiplier-x\">&times;</span>&nbsp;<span class=\"item-multiplier-count\">344</span></span><br>\n" + " </div>\n" + "</div>\n\n" + " </div>\n" + " </div>\n" + " <div id=\"footer\" class=\"categories\">\n" + " <div class=\"footerwrap\">\n" + " <div id=\"footer-menu\">\n" + " <div class=\"top-footer-links\">\n" + " <a href=\"/about\">about</a>\n" + " <a href=\"/help\">help</a>\n" + " <a href=\"/help/badges\">badges</a>\n" + " <a href=\"http://blog.stackexchange.com?blb=1\">blog</a>\n" + " <a href=\"http://chat.stackexchange.com\">chat</a>\n" + " <a href=\"http://data.stackexchange.com\">data</a>\n" + " <a 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Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for Java, please visit: https://docs.oracle.com/javase/7/docs/api/java/util/regex/Pattern.html