Regular Expressions 101

Save & Manage Regex

  • Current Version: 2
  • Save & Share
  • Community Library

Flavor

  • PCRE2 (PHP)
  • ECMAScript (JavaScript)
  • Python
  • Golang
  • Java
  • .NET 7.0 (C#)
  • Rust
  • PCRE (Legacy)
  • Regex Flavor Guide

Function

  • Match
  • Substitution
  • List
  • Unit Tests
Sponsors
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
Processing...

Test String

Code Generator

Language

Generated Code

const regex = /title=".*(title="(.*.)">)/g; // Alternative syntax using RegExp constructor // const regex = new RegExp('title=".*(title="(.*.)">)', 'g') const str = `<div id="video_6003150" class="thumb-block"><div class="thumb-inside"><div class="thumb"><a href="/video6003150/pure_mature_janet_mason"><img src="https://cdn77-pic.xvideos-cdn.com/videos/thumbs169l/03/4b/22/034b224b0f77b7260aa8d6c44b49cb69/034b224b0f77b7260aa8d6c44b49cb69.5.jpg" data-idcdn="10" data-videoid="6003150" id="pic_6003150"><div class="videopv" style="display: none;"><a href="https://www.xvideos.com/video6003150/pure_mature_janet_mason"></a><div class="progress" style="display: none;"><div class="bar" style="width: 100%;"></div></div></div></a></div><button class="watch-later init-ok" title="Ver después"><span class="icon-f icf-clock"></span></button><a class="icon-f icf-check-circle icf-white-fill prof-verified-tick" title="Modelo verificada" href="/verified/videos"></a></div><div class="thumb-under"><p><a href="/video6003150/pure_mature_janet_mason" title="Pure Mature Janet Mason">Pure Mature Janet Mason</a></p><p class="metadata"><span class="bg"><span class="duration">7 min</span><a href="/channels/puremature"><span class="name">Pure Mature</span></a><span><span class="sprfluous"> - </span> 9,7M <span class="sprfluous">Vistas</span></span><span class="sprfluous"> - </span></span></p></div></div>`; // Reset `lastIndex` if this regex is defined globally // regex.lastIndex = 0; let m; while ((m = regex.exec(str)) !== null) { // This is necessary to avoid infinite loops with zero-width matches if (m.index === regex.lastIndex) { regex.lastIndex++; } // The result can be accessed through the `m`-variable. m.forEach((match, groupIndex) => { console.log(`Found match, group ${groupIndex}: ${match}`); }); }

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 JavaScript, please visit: https://developer.mozilla.org/en/docs/Web/JavaScript/Guide/Regular_Expressions