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

/
/
g

Test String

Code Generator

Generated Code

using System; using System.Text.RegularExpressions; public class Example { public static void Main() { string pattern = @"(?<code1>class=""relativetime"">)(?<code2>.+)(?<code3><\/span>)"; string input = @"<!DOCTYPE html> <html> <head> <title>Newest Questions - Page 44 - Electrical Engineering Stack Exchange</title> <link rel=""shortcut icon"" href=""//cdn.sstatic.net/electronics/img/favicon.ico""> <link rel=""apple-touch-icon image_src"" href=""//cdn.sstatic.net/electronics/img/apple-touch-icon.png""> <link rel=""search"" type=""application/opensearchdescription+xml"" title=""Electrical Engineering Stack Exchange"" href=""/opensearch.xml""> <script type=""text/javascript"" src=""//ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js""></script> <script type=""text/javascript"" src=""//cdn.sstatic.net/js/stub.js?v=5d233283ca8d""></script> <link rel=""stylesheet"" type=""text/css"" href=""//cdn.sstatic.net/electronics/all.css?v=672ddec9ce04""> <script type=""text/x-mathjax-config""> MathJax.Hub.Config({""HTML-CSS"": { preferredFont: ""TeX"", availableFonts: [""STIX"",""TeX""], linebreaks: { automatic:true }, EqnChunk: (MathJax.Hub.Browser.isMobile ? 10 : 50) }, tex2jax: { inlineMath: [ [""\\$"", ""\\$""] ], displayMath: [ [""$$"",""$$""], [""\\["", ""\\]""] ], processEscapes: true, ignoreClass: ""tex2jax_ignore|dno"" }, TeX: { noUndefined: { attributes: { mathcolor: ""red"", mathbackground: ""#FFEEEE"", mathsize: ""90%"" } }, Macros: { href: ""{}"" } }, messageStyle: ""none"" }); </script> <script type=""text/javascript"" src=""http://cdn.mathjax.org/mathjax/latest/MathJax.js?config=TeX-AMS_HTML""></script> <script type=""text/javascript""> StackExchange.ready(function () { StackExchange.realtime.init('sockets.ny.stackexchange.com'); StackExchange.realtime.subscribeToInboxNotifications(); StackExchange.realtime.subscribeToReputationNotifications('135'); }); </script> <script type=""text/javascript""> 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}}); 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""}); StackExchange.using.setCacheBreakers({""js/mathjax-editing.js"":""6da1b6cfe19f"",""js/external-editor.js"":""51c0a8d46d29""}); </script> <script type=""text/javascript""> StackExchange.using(""gps"", function() { StackExchange.gps.init(true); }); </script> <script type=""text/javascript""> StackExchange.ready(function () { $('#nav-tour').click(function () { StackExchange.using(""gps"", function() { StackExchange.gps.track(""aboutpage.click"", { aboutclick_location: ""headermain"" }, true); }); }); }); </script> </head> <body class=""questions-page""> <noscript><div id=""noscript-padding""></div></noscript> <div id=""notify-container""></div> <div id=""overlay-header""></div> <div id=""custom-header""></div> <div class=""container""> <div id=""header"" class=headeranon> <div id=""portalLink""> <a class=""genu"" href=""http://stackexchange.com"" onclick=""StackExchange.ready(function(){genuwine.click();});return false;"">Stack Exchange</a> </div> <div id=""topbar""> <div id=""hlinks""> <span id=""hlinks-user""></span> <span id=""hlinks-nav""> <a href=""/users/login?returnurl=%2fquestions%3fpage%3d44%26sort%3dnewest"">sign up</a> <span class=""lsep"">|</span> <a href=""/users/login?returnurl=%2fquestions%3fpage%3d44%26sort%3dnewest"">log in</a> <span class=""lsep"">|</span> </span> <span id=""hlinks-custom""></span> </div> <div id=""hsearch""> <form id=""search"" action=""/search"" method=""get"" autocomplete=""off""> <div> <input autocomplete=""off"" name=""q"" class=""textbox"" placeholder=""search"" tabindex=""1"" type=""text"" maxlength=""240"" size=""28"" value=""> </div> </form> </div> </div> <br class=""cbt""> <div id=""hlogo""> <a href=""/""> Electrical Engineering </a> </div> <div id=""hmenus""> <div class=""nav mainnavs mainnavsanon""> <ul> <li class=""youarehere""><a id=""nav-questions"" href=""/questions"">Questions</a></li> <li><a id=""nav-tags"" href=""/tags"">Tags</a></li> <li><a id=""nav-tour"" href=""/about"">Tour</a></li> <li><a id=""nav-users"" href=""/users"">Users</a></li> </ul> </div> <div class=""nav askquestion""> <ul> <li> <a id=""nav-askquestion"" href=""/questions/ask"">Ask Question</a> </li> </ul> </div> </div> </div> <div id=""content""> <div id=""mainbar""> <div class=""subheader""> <h1 id=""h-all-questions"">All Questions</h1> <div id=""tabs""> <a class=""youarehere"" href=""/questions?sort=newest"" title=""the most recently asked questions"">newest</a> <a href=""/questions?sort=featured"" title=""questions with open bounties""><span class='bounty-indicator-tab'>3</span>featured</a> <a href=""/questions?sort=frequent"" title=""questions with the most links"">frequent</a> <a href=""/questions?sort=votes"" title=""questions with the most votes"">votes</a> <a href=""/questions?sort=active"" title=""questions that have recent activity"">active</a> <a href=""/questions?sort=unanswered"" title=""questions that have no upvoted answers"">unanswered</a> </div> </div> <div id=""questions""> <div class=""question-summary"" id=""question-summary-78358""> <div class=""statscontainer""> <div class=""statsarrow""></div> <div class=""stats""> <div class=""vote""> <div class=""votes""> <span class=""vote-count-post ""><strong>-1</strong></span> <div class=""viewcount"">votes</div> </div> </div> <div class=""status answered""> <strong>1</strong>answer </div> </div> <div class=""views "" title=""34 views""> 34 views </div> </div> <div class=""summary""> <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> <div class=""excerpt""> i want to control infra red short wave heaters 230v,2kw, with some electronic device, it is an open loop system,where i want to give analog signal to heater from 0 to 100% . i cant take Thermocouple ... </div> <div class=""tags t-voltage-regulator t-solid-state-relay t-dimming""> <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> </div> <div class=""started fr""> <div class=""user-info ""> <div class=""user-action-time""> asked <span title=""2013-08-08 10:06:07Z"" class=""relativetime"">Aug 8 at 10:06</span> </div> <div class=""user-gravatar32""> <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> </div> <div class=""user-details""> <a href=""/users/27245/user27245"">user27245</a><br> <span class=""reputation-score"" title=""reputation score"" dir=""ltr"">1</span> </div> </div> </div> </div> </div> <div class=""question-summary"" id=""question-summary-78355""> <div class=""statscontainer""> <div class=""statsarrow""></div> <div class=""stats""> <div class=""vote""> <div class=""votes""> <span class=""vote-count-post ""><strong>0</strong></span> <div class=""viewcount"">votes</div> </div> </div> <div class=""status unanswered""> <strong>0</strong>answers </div> </div> <div class=""views "" title=""47 views""> 47 views </div> </div> <div class=""summary""> <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> <div class=""excerpt""> 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 ... </div> <div class=""tags t-microcontroller t-pic t-rtc""> <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> </div> <div class=""started fr""> <div class=""user-info ""> <div class=""user-action-time""> asked <span title=""2013-08-08 08:52:58Z"" class=""relativetime"">Aug 8 at 8:52</span> </div> <div class=""user-gravatar32""> <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> </div> <div class=""user-details""> <a href=""/users/23841/shail-korat"">shail korat</a><br> <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> </div> </div> </div> </div> </div> <div class=""question-summary"" id=""question-summary-78353""> <div class=""statscontainer""> <div class=""statsarrow""></div> <div class=""stats""> <div class=""vote""> <div class=""votes""> <span class=""vote-count-post ""><strong>1</strong></span> <div class=""viewcount"">vote</div> </div> </div> <div class=""status answered-accepted""> <strong>1</strong>answer </div> </div> <div class=""views "" title=""46 views""> 46 views </div> </div> <div class=""summary""> <h3><a href=""/questions/78353/spi-interfacing-using-serial-port-or-usb"" class=""question-hyperlink"">SPI Interfacing using Serial Port or USB</a></h3> <div class=""excerpt""> 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 ... </div> <div class=""tags t-usb t-serial t-spi t-interface""> <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> </div> <div class=""started fr""> <div class=""user-info ""> <div class=""user-action-time""> asked <span title=""2013-08-08 08:32:08Z"" class=""relativetime"">Aug 8 at 8:32</span> </div> <div class=""user-gravatar32""> <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> </div> <div class=""user-details""> <a href=""/users/7329/subin-sebastian"">Subin Sebastian</a><br> <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> </div> </div> </div> </div> </div> <div class=""question-summary"" id=""question-summary-78351""> <div class=""statscontainer""> <div class=""statsarrow""></div> <div class=""stats""> <div class=""vote""> <div class=""votes""> <span class=""vote-count-post ""><strong>2</strong></span> <div class=""viewcount"">votes</div> </div> </div> <div class=""status answered-accepted""> <strong>2</strong>answers </div> </div> <div class=""views "" title=""54 views""> 54 views </div> </div> <div class=""summary""> <h3><a href=""/questions/78351/trouble-on-understanding-alu-2-bit-design"" class=""question-hyperlink"">Trouble on understanding ALU 2-bit design</a></h3> <div class=""excerpt""> 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 ... </div> <div class=""tags t-alu""> <a href=""/questions/tagged/alu"" class=""post-tag"" title=""show questions tagged 'alu'"" rel=""tag"">alu</a> </div> <div class=""started fr""> <div class=""user-info ""> <div class=""user-action-time""> asked <span title=""2013-08-08 08:20:46Z"" class=""relativetime"">Aug 8 at 8:20</span> </div> <div class=""user-gravatar32""> <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> </div> <div class=""user-details""> <a href=""/users/27251/thecodemonsters"">theCodeMonsters</a><br> <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> </div> </div> </div> </div> </div> <div class=""question-summary"" id=""question-summary-78348""> <div class=""statscontainer""> <div class=""statsarrow""></div> <div class=""stats""> <div class=""vote""> <div class=""votes""> <span class=""vote-count-post ""><strong>3</strong></span> <div class=""viewcount"">votes</div> </div> </div> <div class=""status answered""> <strong>1</strong>answer </div> </div> <div class=""views "" title=""57 views""> 57 views </div> </div> <div class=""summary""> <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> <div class=""excerpt""> I opened a small router and hooked up 2 wires on the PCB (to catch the serial data). That works fine. Now I'm looking for a way to make a small (tiny) connector in the enclosure, so for future use i ... </div> <div class=""tags t-pcb t-connector t-cases t-mount""> <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> </div> <div class=""started fr""> <div class=""user-info ""> <div class=""user-action-time""> asked <span title=""2013-08-08 07:20:56Z"" class=""relativetime"">Aug 8 at 7:20</span> </div> <div class=""user-gravatar32""> <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> </div> <div class=""user-details""> <a href=""/users/8524/rogier"">Rogier</a><br> <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> </div> </div> </div> </div> </div> <div class=""question-summary"" id=""question-summary-78345""> <div class=""statscontainer""> <div class=""statsarrow""></div> <div class=""stats""> <div class=""vote""> <div class=""votes""> <span class=""vote-count-post ""><strong>4</strong></span> <div class=""viewcount"">votes</div> </div> </div> <div class=""status answered-accepted""> <strong>1</strong>answer </div> </div> <div class=""views "" title=""69 views""> 69 views </div> </div> <div class=""summary""> <h3><a href=""/questions/78345/what-happened-to-the-to-3-package"" class=""question-hyperlink"">What happened to the TO-3 package?</a></h3> <div class=""excerpt""> 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 ... </div> <div class=""tags t-packages""> <a href=""/questions/tagged/packages"" class=""post-tag"" title=""show questions tagged 'packages'"" rel=""tag"">packages</a> </div> <div class=""started fr""> <div class=""user-info ""> <div class=""user-action-time""> asked <span title=""2013-08-08 07:05:21Z"" class=""relativetime"">Aug 8 at 7:05</span> </div> <div class=""user-gravatar32""> <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> </div> <div class=""user-details""> <a href=""/users/27167/radagast"">radagast</a><br> <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> </div> </div> </div> </div> </div> <div class=""question-summary"" id=""question-summary-78337""> <div class=""statscontainer""> <div class=""statsarrow""></div> <div class=""stats""> <div class=""vote""> <div class=""votes""> <span class=""vote-count-post ""><strong>16</strong></span> <div class=""viewcount"">votes</div> </div> </div> <div class=""status answered-accepted""> <strong>2</strong>answers </div> </div> <div class=""views "" title=""431 views""> 431 views </div> </div> <div class=""summary""> <h3><a href=""/questions/78337/which-way-does-electricity-power-a-circuit"" class=""question-hyperlink"">Which way does electricity power a circuit?</a></h3> <div class=""excerpt""> 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 ... </div> <div class=""tags t-power-supply t-current t-analog""> <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> </div> <div class=""started fr""> <div class=""user-info ""> <div class=""user-action-time""> asked <span title=""2013-08-08 04:00:29Z"" class=""relativetime"">Aug 8 at 4:00</span> </div> <div class=""user-gravatar32""> <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> </div> <div class=""user-details""> <a href=""/users/27243/tom"">Tom</a><br> <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> </div> </div> </div> </div> </div> <div class=""question-summary"" id=""question-summary-78336""> <div class=""statscontainer""> <div class=""statsarrow""></div> <div class=""stats""> <div class=""vote""> <div class=""votes""> <span class=""vote-count-post ""><strong>1</strong></span> <div class=""viewcount"">vote</div> </div> </div> <div class=""status answered""> <strong>2</strong>answers </div> </div> <div class=""views "" title=""115 views""> 115 views </div> </div> <div class=""summary""> <h3><a href=""/questions/78336/using-relay-with-microcontroller"" class=""question-hyperlink"">Using Relay With Microcontroller</a></h3> <div class=""excerpt""> 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 ... </div> <div class=""tags t-microcontroller t-relay""> <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> </div> <div class=""started fr""> <div class=""user-info ""> <div class=""user-action-time""> asked <span title=""2013-08-08 03:56:44Z"" class=""relativetime"">Aug 8 at 3:56</span> </div> <div class=""user-gravatar32""> <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> </div> <div class=""user-details""> <a href=""/users/27242/wallace"">Wallace</a><br> <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> </div> </div> </div> </div> </div> <div class=""question-summary"" id=""question-summary-78329""> <div class=""statscontainer""> <div class=""statsarrow""></div> <div class=""stats""> <div class=""vote""> <div class=""votes""> <span class=""vote-count-post ""><strong>0</strong></span> <div class=""viewcount"">votes</div> </div> </div> <div class=""status answered""> <strong>2</strong>answers </div> </div> <div class=""views "" title=""48 views""> 48 views </div> </div> <div class=""summary""> <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> <div class=""excerpt""> 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 ... </div> <div class=""tags t-power-supply t-dc""> <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> </div> <div class=""started fr""> <div class=""user-info ""> <div class=""user-action-time""> asked <span title=""2013-08-08 02:05:53Z"" class=""relativetime"">Aug 8 at 2:05</span> </div> <div class=""user-gravatar32""> <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> </div> <div class=""user-details""> <a href=""/users/17060/user1285419"">user1285419</a><br> <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> </div> </div> </div> </div> </div> <div class=""question-summary"" id=""question-summary-78328""> <div class=""statscontainer""> <div class=""statsarrow""></div> <div class=""stats""> <div class=""vote""> <div class=""votes""> <span class=""vote-count-post ""><strong>0</strong></span> <div class=""viewcount"">votes</div> </div> </div> <div class=""status answered""> <strong>1</strong>answer </div> </div> <div class=""views "" title=""86 views""> 86 views </div> </div> <div class=""summary""> <h3><a href=""/questions/78328/reducing-capacitance-of-a-wire"" class=""question-hyperlink"">Reducing capacitance of a wire</a></h3> <div class=""excerpt""> 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? </div> <div class=""tags t-capacitor t-capacitance""> <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> </div> <div class=""started fr""> <div class=""user-info ""> <div class=""user-action-time""> asked <span title=""2013-08-08 02:03:19Z"" class=""relativetime"">Aug 8 at 2:03</span> </div> <div class=""user-gravatar32""> <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> </div> <div class=""user-details""> <a href=""/users/27085/j03m"">j03m</a><br> <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> </div> </div> </div> </div> </div> <div class=""question-summary"" id=""question-summary-78322""> <div class=""statscontainer""> <div class=""statsarrow""></div> <div class=""stats""> <div class=""vote""> <div class=""votes""> <span class=""vote-count-post ""><strong>-2</strong></span> <div class=""viewcount"">votes</div> </div> </div> <div class=""status answered-accepted""> <strong>1</strong>answer </div> </div> <div class=""views "" title=""63 views""> 63 views </div> </div> <div class=""summary""> <h3><a href=""/questions/78322/ground-wire-installation"" class=""question-hyperlink"">Ground Wire Installation [closed]</a></h3> <div class=""excerpt""> 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 ... </div> <div class=""tags t-wiring""> <a href=""/questions/tagged/wiring"" class=""post-tag"" title=""show questions tagged 'wiring'"" rel=""tag"">wiring</a> </div> <div class=""started fr""> <div class=""user-info ""> <div class=""user-action-time""> asked <span title=""2013-08-08 00:38:13Z"" class=""relativetime"">Aug 8 at 0:38</span> </div> <div class=""user-gravatar32""> <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> </div> <div class=""user-details""> <a href=""/users/27238/khiz"">khiz</a><br> <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> </div> </div> </div> </div> </div> <div class=""question-summary"" id=""question-summary-78319""> <div class=""statscontainer""> <div class=""statsarrow""></div> <div class=""stats""> <div class=""vote""> <div class=""votes""> <span class=""vote-count-post ""><strong>1</strong></span> <div class=""viewcount"">vote</div> </div> </div> <div class=""status answered""> <strong>2</strong>answers </div> </div> <div class=""views "" title=""63 views""> 63 views </div> </div> <div class=""summary""> <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> <div class=""excerpt""> I am building a solar swamp cooler for burning man (hot dry desert environment). Purchased a 15w solar panel that outputs 0.9a at 20V in full sun (verified as true with my voltmeter). The solar panel ... </div> <div class=""tags t-power-supply t-dc t-solar-cell""> <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> </div> <div class=""started fr""> <div class=""user-info ""> <div class=""user-action-time""> asked <span title=""2013-08-08 00:07:34Z"" class=""relativetime"">Aug 8 at 0:07</span> </div> <div class=""user-gravatar32""> <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> </div> <div class=""user-details""> <a href=""/users/27183/nimble"">nimble</a><br> <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> </div> </div> </div> </div> </div> <div class=""question-summary"" id=""question-summary-78318""> <div class=""statscontainer""> <div class=""statsarrow""></div> <div class=""stats""> <div class=""vote""> <div class=""votes""> <span class=""vote-count-post ""><strong>0</strong></span> <div class=""viewcount"">votes</div> </div> </div> <div class=""status unanswered""> <strong>0</strong>answers </div> </div> <div class=""views "" title=""23 views""> 23 views </div> </div> <div class=""summary""> <h3><a href=""/questions/78318/altium-simulation-node-voltages"" class=""question-hyperlink"">Altium Simulation Node Voltages</a></h3> <div class=""excerpt""> When simulating a circuit in Altium it generates signals based on the components and net labels placed in the circuit, eg: <span class='tex2jax_ignore'>r1[i] r1[p] v1 v2 </span> Altium also adds the ... </div> <div class=""tags t-simulation t-circuit-analysis t-altium""> <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> </div> <div class=""started fr""> <div class=""user-info ""> <div class=""user-action-time""> asked <span title=""2013-08-07 23:55:41Z"" class=""relativetime"">Aug 7 at 23:55</span> </div> <div class=""user-gravatar32""> <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> </div> <div class=""user-details""> <a href=""/users/27237/troy"">Troy</a><br> <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> </div> </div> </div> </div> </div> <div class=""question-summary"" id=""question-summary-78315""> <div class=""statscontainer""> <div class=""statsarrow""></div> <div class=""stats""> <div class=""vote""> <div class=""votes""> <span class=""vote-count-post ""><strong>1</strong></span> <div class=""viewcount"">vote</div> </div> </div> <div class=""status answered-accepted""> <strong>2</strong>answers </div> </div> <div class=""views "" title=""146 views""> 146 views </div> </div> <div class=""summary""> <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> <div class=""excerpt""> 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 ... </div> <div class=""tags t-power t-voltage t-current t-resistance t-ohms-law""> <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> </div> <div class=""started fr""> <div class=""user-info ""> <div class=""user-action-time""> asked <span title=""2013-08-07 23:08:48Z"" class=""relativetime"">Aug 7 at 23:08</span> </div> <div class=""user-gravatar32""> <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> </div> <div class=""user-details""> <a href=""/users/27236/wingleader"">wingleader</a><br> <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> </div> </div> </div> </div> </div> <div class=""question-summary"" id=""question-summary-78307""> <div class=""statscontainer""> <div class=""statsarrow""></div> <div class=""stats""> <div class=""vote""> <div class=""votes""> <span class=""vote-count-post ""><strong>-1</strong></span> <div class=""viewcount"">votes</div> </div> </div> <div class=""status answered-accepted""> <strong>4</strong>answers </div> </div> <div class=""views "" title=""89 views""> 89 views </div> </div> <div class=""summary""> <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> <div class=""excerpt""> 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 ... </div> <div class=""tags t-multimeter t-polarity""> <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> </div> <div class=""started fr""> <div class=""user-info ""> <div class=""user-action-time""> asked <span title=""2013-08-07 21:38:15Z"" class=""relativetime"">Aug 7 at 21:38</span> </div> <div class=""user-gravatar32""> <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> </div> <div class=""user-details""> <a href=""/users/27233/eydelber"">eydelber</a><br> <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> </div> </div> </div> </div> </div> </div> <br class=""cbt""> <div class=""page-sizer fr""> <a href=""/questions?pagesize=15&amp;sort=newest"" title=""show 15 items per page"" class=""page-numbers current"">15</a> <a href=""/questions?pagesize=30&amp;sort=newest"" title=""show 30 items per page"" class=""page-numbers "">30</a> <a href=""/questions?pagesize=50&amp;sort=newest"" title=""show 50 items per page"" class=""page-numbers "">50</a> <span class=""page-numbers desc"">per page</span> </div> <div class=""pager fl"" > <a href=""/questions?page=43&amp;sort=newest"" title=""go to page 43"" rel=""prev""><span class=""page-numbers prev"">prev </span></a> <a href=""/questions?page=1&amp;sort=newest"" title=""go to page 1""><span class=""page-numbers"">1</span></a> <span class=""page-numbers dots"">&hellip;</span> <a href=""/questions?page=42&amp;sort=newest"" title=""go to page 42""><span 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questions tagged 'avr'"" rel=""tag"">avr</a>&nbsp;<span class=""item-multiplier""><span class=""item-multiplier-x"">&times;</span>&nbsp;<span class=""item-multiplier-count"">493</span></span><br> <a href=""/questions/tagged/op-amp"" class=""post-tag"" title=""show questions tagged 'op-amp'"" rel=""tag"">op-amp</a>&nbsp;<span class=""item-multiplier""><span class=""item-multiplier-x"">&times;</span>&nbsp;<span class=""item-multiplier-count"">447</span></span><br> <a href=""/questions/tagged/current"" class=""post-tag"" title=""show questions tagged 'current'"" 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> <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> <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> <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> <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> <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> <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> <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> <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 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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 C#, please visit: https://msdn.microsoft.com/en-us/library/system.text.regularexpressions.regex(v=vs.110).aspx