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

/
/
gmi

Test String

Code Generator

Language

Generated Code

re = /(?:class|className)=(?:["']\W+\s*(?:\w+)\()?["']([^'"]+)['"]/mi str = '<div id="content" class="container"> <div style="overflow:hidden;margin-top:30px"> <div style="width:300px;height:250px;float:left"> <ins class="adsbygoogle turbo" style="display:inline-block !important;width:300px;min-height:250px; display: none !important;" data-ad-client="ca-pub-1904398025977193" data-ad-slot="4723729075" data-color-link="2244BB" qgdsrhu="" hidden=""></ins> <script> (adsbygoogle = window.adsbygoogle || []).push({}); </script></div> </div> <img src="http://static.teleman.pl/images/pixel.gif?show,753804,20160812" alt="" width="0" height="0" hidden="" style="display: none !important;"> </div>' # 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