Save & Share

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
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]
  • Character class intersection
    [\w&&[^\d]]
  • 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 = /^\[(?!\^)(.*)\]: <?((?:[a-zA-Z]\:|\\\\[^\/\\:*?"<>|]+\\[^\/\\:*?"<>|]+|\.{1,2})(?:\\[^\/\\:*?"<>|]+)+(?:\.[^\/\\:*?"<>| ]+)|(?:\.{1,2}|~){0,1}(?:(?:\/|\\)(?:[a-zA-Z0-9._-])*)+|\w+:(?:\/?\/?)[^\s>]+)>?(?:\n? +["'(](.*)["')])?(?: \{(.*)\})?/gm; // Alternative syntax using RegExp constructor // const regex = new RegExp('^\\[(?!\\^)(.*)\\]: <?((?:[a-zA-Z]\\:|\\\\\\\\[^\\\/\\\\:*?"<>|]+\\\\[^\\\/\\\\:*?"<>|]+|\\.{1,2})(?:\\\\[^\\\/\\\\:*?"<>|]+)+(?:\\.[^\\\/\\\\:*?"<>| ]+)|(?:\\.{1,2}|~){0,1}(?:(?:\\\/|\\\\)(?:[a-zA-Z0-9._-])*)+|\\w+:(?:\\\/?\\\/?)[^\\s>]+)>?(?:\\n? +["\'(](.*)["\')])?(?: \\{(.*)\\})?', 'gm') const str = `|(?:\\\\|\\/ [my label 1]: /foo/bar.jpg "My title, optional" [my label 2]: ~/foo/bar.png "My title, optional" [my label 1]: ~/foo/.img "My title, optional" [my label 1]: ~/.img "My title, optional" [my label 2]: /foo [my label 3]: https://fsf.org (The free software foundation) [my label 3]: (The free software foundation) [my label 4]: /bar#special 'A title in single quotes' [my label 1]: ./foo/bar.html "My title, optional" [my label 2]: ../foo/bar.html [my label 1]: ./foo/bar.html "My title, optional" [my label 3]: https://fsf.org (The free software foundation) [my label 4]: /foo/bar.html#special 'A title in single quotes' [my label 5]: <http://foo.bar.baz> [my label 3]: https://fsf.org "The free software foundation" [my label 5]: <http://foo.bar.baz> [my label 1]: ..\\foo\\bar.html "My title, optional" [my label 1]: C:\\foo\\bar.html "My title, optional" [my label 1]: .\\foo\\bar.html "My title, optional" [my label 1]: \\\\unc.server.tld.co\\path\\to\\file.ext "My title, optional" [my label 2]: C:\\foo [my label 3]: https://fsf.org (The free software foundation) [my label 2]: /foo [my label 3]: https://fsf.org (The free software foundation) (?:\\.{1,2}|~){0,1}(?:(?:\\/|\\\\)(?:[a-zA-Z0-9._ -])*)+ ^\\[(?!\\^)(.*)\\]: <?((?:[a-zA-Z]\\:|\\\\\\\\[^\\/\\\\:*?"<>|]+\\\\[^\\/\\\\:*?"<>|]+|\\.{1,2})(?:\\\\[^\\/\\\\:*?"<>|]+)+(?:\\.[^\\/\\\\:*?"<>| ]+)|(?:\\.{1,2}|~){0,1}(?:(?:\\/|\\\\)(?:[a-zA-Z0-9._ -])*)+|\\w+:(?:\\/?\\/?)[^\\s]+)>?(?:\\n? +["'(](.*)["')])?(?: \\{(.*)\\})?`; // 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