Regular Expressions 101

Save & Manage Regex

  • Current Version: 5
  • 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

Substitution
Processing...

Code Generator

Language

Generated Code

const regex = new RegExp('<a \\s+ ((?:[^\\s<>\\'"=]+(?:=(?:"[^"]*"|\\'[^\\']*\\'|[^\\s\\'">]+))?\\s+)*) href=(?|"([^"]*\\.(?:jpe?g|png))"|\\'([^\\']*\\.(?:jpe?g|png))\\'|([^\\s\\'">]*\\.(?:jpe?g|png))(?=[>\\s])) ((?:\\s+[^\\s<>\\'"=]+(?:=(?:"[^"]*"|\\'[^\\']*\\'|[^\\s\\'">]+))?)*) \\s*> (.*?) </a>', 'gmis') const str = `<p>С этой формы приходят заявки <a href="https://site.com/lack_tech.php">https://site.com/lack_tech.php</a></p> <p>Или что ты имеешь ввиду?</p> <div class="attachment_files_message"> <p>Прикреплённые файлы:</p> <a href="http://site.com/public/uploads/kylticket/2670/Screenshot_1.png" target="_blank">Screenshot_1.png</a> <a href=http://site.com/public/uploads/kylticket/2670/Screenshot_1.png target="_blank">Screenshot_1.png</a> <a target="_blank" href="http://site.com/public/uploads/kylticket/2670/Screenshot_1.png" >Screenshot_1.png</a> </div>`; const subst = `<a $1$3 data-fancybox="gallery" href="$2"><img src="$2" alt="" class="tmp_class"></a>`; // The substituted value will be contained in the result variable const result = str.replace(regex, subst); console.log('Substitution result: ', result);

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