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

/
/
gm

Test String

Code Generator

Language

Generated Code

use strict; my $str = ' </header><main class="page-content"><nav class="breadcrumb margin-top-1.00 margin-top-0.50-lg margin-top-0.00-md margin-horizontal-2.00"><ul class="breadcrumb__list"><li class="breadcrumb__item"><span class="breadcrumb__separator icon icon--arrow-double-right"></span><a class="breadcrumb__text" href="/" title="Home">Home</a></li><li class="breadcrumb__item"><span class="breadcrumb__separator icon icon--arrow-double-right"></span><a class="breadcrumb__text" href="/aktienkurse" title="Aktien">Aktien</a></li><li class="breadcrumb__item"><span class="breadcrumb__separator icon icon--arrow-double-right"></span><span class="breadcrumb__text" title="AURELIUS Aktie">AURELIUS Aktie</span></li><script type="application/ld+json">{"@context": "http://schema.org","@type": "BreadcrumbList","itemListElement": [{"@type": "ListItem","position": 1,"item": {"@type": "WebPage","@id": "/","name": "Home"}},{"@type": "ListItem","position": 2,"item": {"@type": "WebPage","@id": "/aktienkurse","name": "Aktien"}},{"@type": "ListItem","position": 3,"item": {"@type": "WebPage","@id": "/aktien/aurelius-aktie","name": "AURELIUS Aktie"}}]}</script></ul></nav><section class="page-content__container"><!--CenterColumn_1--><div class="page-content__item no-grid-container"><div class="snapshot"><script>document.addEventListener(\'DOMContentLoaded\', function() {if(isFinnetZeroLoginCookieActive()){document.querySelectorAll(\'.page-content__container .snapshot\').forEach(function(e) {e.classList.add(\'snapshot--is-zero-user\');});}});</script><h1 class="snapshot__headline">AURELIUS Aktie</h1><div class="snapshot__depot-actions"><a class="snapshot__depot-add" href="/depot/watchlist.asp?isisin=DE000A0JK2A8&inTyp=1" title="Depot / Watchlist"><span class="icon icon--depot-add"></span></a></div><div id="snapshotTrading" class="snapshot__trading"><div class="snapshot__trading-buy-btn button button--success button--stretch-md"><span class="button__label">Kaufen</span></div><div class="snapshot__trading-sell-btn button button--danger button--stretch-md"><span class="button__label">Verkaufen</span></div></div><div class="snapshot__values"><span id="snapshot-value-fst-current-0" class="snapshot__value-current realtime-push"><span>22,32</span> <span class="snapshot__value-unit">EUR</span> </span><span id="snapshot-value-fst-absolute-0" class="snapshot__value-absolut'; my $regex = qr/class="snapshot__value-current realtime-push"><span>(\d*,\d*)<span> <span class="snapshot__value-unit">EUR/mp; if ( $str =~ /$regex/g ) { print "Whole match is ${^MATCH} and its start/end positions can be obtained via \$-[0] and \$+[0]\n"; # print "Capture Group 1 is $1 and its start/end positions can be obtained via \$-[1] and \$+[1]\n"; # print "Capture Group 2 is $2 ... and so on\n"; } # ${^POSTMATCH} and ${^PREMATCH} are also available with the use of '/p' # Named capture groups can be called via $+{name}

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 Perl, please visit: http://perldoc.perl.org/perlre.html