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

/
/
gm

Test String

Substitution

Processing...

Code Generator

Language

Generated Code

$re = '/https:(.*?)\/track\/(.*?)\?(.*)/m'; $str = 'https://open.spotify.com/track/7cy1bEJV6FCtDaYpsk8aG6?si=4NrCtBYRRt6QIEggvr5-UQ https://open.spotify.com/track/2mKS9ECgxNSRQgmQO7CY8x?si=70ua2XGPTvy5tg3tAfSIHQ https://open.spotify.com/track/1rqqCSm0Qe4I9rUvWncaom?si=j8IHrLXASjmgSOc77seefQ https://open.spotify.com/track/7MRY4VpCuZvBmFda6ZCk2G?si=BIlDAq22RkSb559U3Ymdgw https://open.spotify.com/track/1yG1OpMiV8WtDeOYEBvNW8?si=VSOSzYHCQGW7-DZoDTq15A https://open.spotify.com/track/0zYkf4pCiGAhEp5Z3iUkml?si=DQ0o-GGRQfmqABxDcqeywQ https://open.spotify.com/track/4HCcvFdHfwR2u3WPPPVRv6?si=N_l1p_fMTXSYdEA2V4uKKg https://open.spotify.com/track/6A3ff44rkAsNUPq5ZpG0Lw?si=X6E_z8ClSm-gqOh_PNJ8aA https://open.spotify.com/track/1owidcBLuyqbtlJRWyRubJ?si=AfuGmcQ4RL6znQrBnHNsUQ https://open.spotify.com/track/72OeMxh65OcA6riQ7fRH6c?si=jXksouMoTTy9gHiusgAN3Q https://open.spotify.com/track/1PqZRvgKb2OepsA7aeb64y?si=n7RCpDM_TOeAsSSgJqecCQ https://open.spotify.com/track/4K8pmNLIAhetFRpEBGV0dJ?si=O_Vwez-xQ-ufDqeSjJmYjw https://open.spotify.com/track/3DVNUiBeYKbp7JvvcrfqZB?si=vRTYM_lXRP--LwoFg44M8Q https://open.spotify.com/track/4w2iAP3X4FkpPb5kjRdIDx?si=w0PH7da9RgeWspRVYrFeFw https://open.spotify.com/track/0Y2QWrhPh6ATyaWYT0QLIR?si=hwnF_-1aTcioBOSJLHNE1w https://open.spotify.com/track/4pkZNPC6yeMnQABwkTmsR6?si=JC6rPKnBQRCGF6NP9I6QKg https://open.spotify.com/track/5rR1C059TESZuNiiYEzZBa?si=-ncveFyxS3KDa7Yf54opZg https://open.spotify.com/track/6aFc0W6xVS9kN9E9NGekAl?si=9Jiu-bANSuaPPjJOE_b5GQ https://open.spotify.com/track/6ZF6PsmadIgyuxp0wqD9qO?si=HardRQQzSXGMxiscNsuuIQ https://open.spotify.com/track/7HhawuOJ17618C4VJfJn2K?si=Ve0FWw02SDuhA3FO9ZRfVA https://open.spotify.com/track/2ZFAzZ5uluMR8TeO6YEy52?si=QYw76ZYDTAqmigwp-4K0_w https://open.spotify.com/track/7IO8jHHbV9P4VtcfeGvEZy?si=xp4fWYXVQP-NBhjF6M6LkQ https://open.spotify.com/track/0CLYfCWlqR1zB6Wqi6VTwy?si=_yiWBH82SUmNfKrcoUFSXw https://open.spotify.com/track/4PAT0WuPzHOn94bP0BYZUz?si=oPcZRxB0TYGbjzvz54ZkPw https://open.spotify.com/track/5XKDliIGPTUnNRwRZsd0oN?si=okAtielaT2ChEL2vK3DV8Q https://open.spotify.com/track/5fpj84RsT9cOTfWUCxBTXu?si=5He0nt3oQzSipKrtwaKJ-A'; $subst = "spotify:track:$2"; $result = preg_replace($re, $subst, $str); echo "The result of the substitution is ".$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 PHP, please visit: http://php.net/manual/en/ref.pcre.php