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

/
/

Test String

Code Generator

Language

Generated Code

const regex = /variants\[([0-9]{6})\]\[1\]\[([0-9]{1,6})\] \= 237228\;/; // Alternative syntax using RegExp constructor // const regex = new RegExp('variants\\[([0-9]{6})\\]\\[1\\]\\[([0-9]{1,6})\\] \\= 237228\\;', '') const str = `var variants = []; variants[208091] = [[80.00, 958, new Image(), '8.00', 80.00, "LUG-CENTRIC-SPACERS"],{},{},[]]; variants[208091][1][36366] = 237228; variants[208092] = [[80.00, 941, new Image(), '8.00', 80.00, "4112-5-55-L"],{},{},[]]; variants[208092][1][36366] = 237229; variants[208093] = [[80.00, 957, new Image(), '8.00', 80.00, "4112-5-55-LM"],{},{},[]]; variants[208093][1][36366] = 237230; variants[208094] = [[80.00, 954, new Image(/r), '8.00', 80.00, "4112-6-55-L"],{},{},[]]; variants[208094][1][36366] = 237231; variants[208095] = [[115.00, 948, new Image(1), '8.00', 115.00, "4112-8-65-L"],{},{},[]]; variants[208095][1][36366] = 237232; variants[208096] = [[115.00, 958, new Image(69), '8.00', 115.00, "4112-8-65-LM"],{},{},[]]; variants[208096][1][36366] = 237233; variants[216938] = [[80.00, 998, new Image(), '8.00', 80.00, "4112-6-55-14-L"],{},{},[]]; variants[216938][1][36366] = 244691; variants[216939] = [[115.00, 1000, new Image(), '8.00', 115.00, "4112-8-170-L"],{},{},[]]; variants[216939][1][36366] = 244692; variants[218025] = [[80.00, 998, new Image(), '8.00', 80.00, "4112-5-45-L"],{},{},[]]; variants[218025][1][36366] = 245809; variants[228776] = [[115.00, 1000, new Image(), '8.00', 115.00, "4112-8-180-L"],{},{},[]]; variants[228776][1][36366] = 254512; variants[228819] = [[80.00, 1000, new Image(), '8.00', 80.00, "4112-5-150-L"],{},{},[]]; variants[228819][1][36366] = 254558; `; // Reset `lastIndex` if this regex is defined globally // regex.lastIndex = 0; let m; if ((m = regex.exec(str)) !== null) { // 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