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

/
/
ig

Test String

Substitution

Processing...

Code Generator

Language

Generated Code

const regex = /([+0]?[06]?)(?&sep)(36)?(?&sep)(?P<aera>1|[2-9][0-9])(?&sep)(?P<num>\d{3})(?&sep)(\d{2})(?'sep'[\)\(-\/\.x ]*){2}/ig; // Alternative syntax using RegExp constructor // const regex = new RegExp('([+0]?[06]?)(?&sep)(36)?(?&sep)(?P<aera>1|[2-9][0-9])(?&sep)(?P<num>\\d{3})(?&sep)(\\d{2})(?\'sep\'[\\)\\(-\\\/\\.x ]*){2}', 'ig') const str = `+36 20 800 8848 36 1 267-5260 +36 1 267 5260 +36 24 415 351 06 (24) 415 351 6(1)415 3510 00361-267-5260 0036-1-267-5260 0036-1-267-52-60 208008848 20800 88-48 00 34 800 828 ((06)|[\\+0]{0,2}\\s*36) [+0]{0,2}(?&sep)36`; const subst = `$3$4$5$6`; // 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