Regular Expressions 101

Save & Share

Flavor

  • PCRE2 (PHP >=7.3)
  • PCRE (PHP <7.3)
  • ECMAScript (JavaScript)
  • Python
  • Golang
  • Java 8
  • .NET 7.0 (C#)
  • Rust
  • Regex Flavor Guide

Function

  • Match
  • Substitution
  • List
  • Unit Tests

Tools

Sponsors
There are currently no sponsors. Become a sponsor today!
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

/
/
img

Test String

Code Generator

Language

Generated Code

$re = '/<!-- AppInternalsXpert BMX Integration Begin -->(.*[\s\S]*)<!-- AppInternalsXpert BMX Integration End -->/im'; $str = ' <script> $(function() { $( ".tabs" ).tabs(); }); </script> <!-- AppInternalsXpert BMX Integration Begin --> <script> if(!RVBD_EUE){ var RVBD_EUE={startJS:Number(new Date()), clientId:\'\',appId:1, collector:\'apmperformance.correios.com.br\', collectorHttpPort:80, collectorHttpsPort:443, sv:\'0401\', ajax:true, sync:true, ajaxResponseTime:true}; (function(){ var w=window,l=w.addEventListener,m=w.attachEvent, d=document,s=\'script\',t=\'load\',o=RVBD_EUE, r=((\'https:\'===d.location.protocol)? \'https://apmperformance.correios.com.br:443\': \'http://apmperformance.correios.com.br:80\')+ \'/jsi/riverbed_appinternals.d.\'+ (o.ajax?\'ajax.js\':\'js\'),p=(\'onpagehide\' in w),e=p?\'pageshow\':t, j=d.createElement(s),x=d.getElementsByTagName(s)[0], h=function(y){o.ldJS=o.ldJS||new Date();o.per=y?y.persisted:null;}, i=function(){o.ld=1;};o.cookie=d.cookie;d.cookie= \'_op_aixPageId=0; path=/; expires=\'+(new Date(0)).toGMTString(); o.cookieAfterDelete=d.cookie;j.async=1;j.src=r; if(l){l(e,h,false);if(p){l(t,i,false);}}else if(m) {m(\'on\'+e,h);if(p){m(\'on\'+t,i);}} if(o.sync){d.write(\'<\'+s+\' src=\\\'\'+r+\'\\\'></\'+s+\'>\');} else{x.parentNode.insertBefore(j,x);} })();} </script> <script>if(!RVBD_EUE_PARAM){var RVBD_EUE_PARAM={};} RVBD_EUE_PARAM.pageId = \'a2_e6e8c617-d7ec-4acd-a432-08b0febc30e0\';</script> <!-- AppInternalsXpert BMX Integration End --> [cadastrado] '; preg_match_all($re, $str, $matches, PREG_SET_ORDER, 0); // Print the entire match result var_dump($matches);

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 PHP, please visit: http://php.net/manual/en/ref.pcre.php