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

r"
"
g

Test String

Code Generator

Language

Generated Code

re = /(?xs)<tr>[^<]*?<td.*?>(.*?)<\/.*? <td.*?>.*?(?#skip second col) <td.*?>(?:<.*?>)+?((?:(?!<).)*)(?:<.*?>)+?<\/td.*? <td.*?>(.*?)<\/.*? id=([0-9]+)/ str = '<!DOCTYPE html> <html lang="en"> <head> <meta name="viewport" content="width=device-width, initial-scale=1"> <link rel="apple-touch-icon" sizes="180x180" href="/apple-touch-icon.png"> <link rel="icon" type="image/png" sizes="32x32" href="/favicon-32x32.png"> <link rel="icon" type="image/png" sizes="16x16" href="/favicon-16x16.png"> <link rel="manifest" href="/manifest.json"> <link rel="mask-icon" href="/safari-pinned-tab.svg" color="#5bbad5"> <meta name="theme-color" content="#ffffff"> <link rel="stylesheet" href="/vendor/font-awesome/css/font-awesome.min.css?v=1510914902"> <link rel="stylesheet" href="/vendor/sortable/sortable-theme-bootstrap.css?v=1510914902"> <link rel="stylesheet" href="/css/pfSense-dark.css?v=1510914901" /> <title>p2fw06.infra.memority.local - System: Certificate Manager: CAs</title> <script type="text/javascript"> //<![CDATA[ var events = events || []; //]]> </script> <script type="text/javascript">if (top != self) {top.location.href = self.location.href;}</script><script type="text/javascript">var csrfMagicToken = "sid:3ad881b442e7edf5ea207f041692c5e0620f9c2f,1544601914";var csrfMagicName = "__csrf_magic";</script><script src="/csrf/csrf-magic.js" type="text/javascript"></script></head> <body id="2"> <nav id="topmenu" class="navbar navbar-static-top navbar-inverse"> <div class="container"> <div class="navbar-header"> <button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#pf-navbar"> <span class="sr-only">Toggle navigation</span> <span class="icon-bar"></span> <span class="icon-bar"></span> <span class="icon-bar"></span> </button> <a class="navbar-brand" href="/"> <svg id="logo" role="img" aria-labelledby="pfsense-logo" x="0px" y="0px" viewBox="0 0 282.8 84.2"> <title id="pfsense-logo-svg">pfSense Logo</title> <path class="logo-st0" d="M27.8,57.7c2.9,0,5.4-0.9,7.5-2.6c2.1-1.7,3.6-4,4.4-6.8c0.8-2.8,0.6-5.1-0.5-6.8c-1.1-1.7-3.2-2.6-6.1-2.6 c-2.9,0-5.4,0.9-7.5,2.6c-2.1,1.7-3.5,4-4.3,6.8c-0.8,2.8-0.7,5.1,0.5,6.8C22.8,56.9,24.8,57.7,27.8,57.7"/> <path class="logo-st0" d="M115.1,46.6c-1.5-0.8-3-1.4-4.7-1.8c-1.7-0.4-3.2-0.7-4.7-1.1c-1.5-0.3-2.7-0.7-3.6-1.1c-0.9-0.4-1.4-1.1-1.4-2 c0-1.1,0.5-1.9,1.4-2.4c0.9-0.5,1.9-0.7,2.8-0.7c2.8,0,5,1,6.7,3.1l7-7c-1.7-1.8-3.9-3.1-6.4-3.8c-2.5-0.7-5-1.1-7.4-1.1 c-1.9,0-3.9,0.2-5.7,0.7c-1.9,0.5-3.6,1.2-5,2.3c-1.5,1-2.6,2.3-3.5,3.9c-0.9,1.6-1.3,3.5-1.3,5.7c0,2.3,0.5,4.2,1.4,5.6 c0.9,1.4,2.1,2.5,3.6,3.3c1.5,0.8,3,1.3,4.7,1.7c1.7,0.4,3.2,0.7,4.7,1.1c1.5,0.3,2.7,0.7,3.6,1.2c0.9,0.5,1.4,1.2,1.4,2.2 c0,1-0.5,1.7-1.6,2.1c-1.1,0.4-2.3,0.6-3.6,0.6c-1.7,0-3.3-0.3-4.6-1c-1.3-0.7-2.5-1.7-3.6-3l-7,7.7c1.8,1.9,4.1,3.2,6.7,3.9 c2.7,0.7,5.3,1.1,7.9,1.1c2,0,4-0.2,6.1-0.6c2-0.4,3.9-1,5.5-2c1.6-0.9,3-2.2,4-3.8c1-1.6,1.6-3.5,1.6-5.9c0-2.3-0.5-4.2-1.4-5.6 C117.7,48.6,116.5,47.4,115.1,46.6"/> <path 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All Rights Reserved. [<a href="/license.php" class="tblnk">view license</a>] <a id="tpr" style="display: none;" href="#" title="Top of page"><i class="fa fa-caret-square-o-up pull-right"></i></a> </p> </div> </footer> <!-- This use of filemtime() is intended to fool the browser into reloading the file (not using the cached version) if the file is changed --> <script src="/vendor/jquery/jquery-1.12.0.min.js?v=1510914902"></script> <script src="/vendor/jquery/jquery-ui-1.11.4.min.js?v=1510914902"></script> <script src="/vendor/bootstrap/js/bootstrap.min.js?v=1510914902"></script> <script src="/js/pfSense.js?v=1513000593"></script> <script src="/js/pfSenseHelpers.js?v=1510914901"></script> <script src="/js/polyfills.js?v=1510914901"></script> <script src="/vendor/sortable/sortable.js?v=1510914902"></script> <script type="text/javascript"> //<![CDATA[ // Un-hide the "Top of page" icons if the page is larger than the window if ($(document).height() > $(window).height()) { $(\'[id^=tp]\').show(); } //]]> </script> <script type="text/javascript">CsrfMagic.end();</script></body> </html> ' # Print the match result str.scan(re) do |match| puts match.to_s end

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 Ruby, please visit: http://ruby-doc.org/core-2.2.0/Regexp.html