Save & Share

  • Current Version: 1
  • Update Regex
    ctrl+⇧+s
  • Save new Regex
    ctrl+s
  • Add to 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
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
Processing...

Test String

Substitution
Processing...

Code Generator

Language

Generated Code

const regex = /([0-9a-f]{2})([0-9a-f]{2})?([0-9a-f]{2})?([0-9a-f]{2})?([0-9a-f]{2})?([0-9a-f]{2})?([0-9a-f]{2})?([0-9a-f]{2})?([0-9a-f]{2})?([0-9a-f]{2})?([0-9a-f]{2})?([0-9a-f]{2})?([0-9a-f]{2})?([0-9a-f]{2})?([0-9a-f]{2})?([0-9a-f]{2})?/gmi; // Alternative syntax using RegExp constructor // const regex = new RegExp('([0-9a-f]{2})([0-9a-f]{2})?([0-9a-f]{2})?([0-9a-f]{2})?([0-9a-f]{2})?([0-9a-f]{2})?([0-9a-f]{2})?([0-9a-f]{2})?([0-9a-f]{2})?([0-9a-f]{2})?([0-9a-f]{2})?([0-9a-f]{2})?([0-9a-f]{2})?([0-9a-f]{2})?([0-9a-f]{2})?([0-9a-f]{2})?', 'gmi') const str = `some random text 000102030405060708090A0B0C0D0E0F101112131415161718191A1B1C1D1E1F202122 and more text`; const subst = `\t0x$1${2:+,0x$2:}${3:+,0x$3:}${4:+,0x$4:}${5:+,0x$5:}${6:+,0x$6:}${7:+,0x$7:}${8:+,0x$8:}${9:+,0x$9:}${10:+,0x$10:}${11:+,0x$11:}${12:+,0x$12:}${13:+,0x$13:}${14:+,0x$14:}${15:+,0x$15:}${16:+,0x$16:}\n`; // 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