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

/
/
g

Test String

Code Generator

Language

Generated Code

const regex = /(?<Fname>.*\.)(S(?<se>\d{1,2})E(?<ep>\d{2,3}).*|(?<season>S\d{1,2}-S\d{2,3}).*|(?<yr>\d{4}[^p]).*)/g; // Alternative syntax using RegExp constructor // const regex = new RegExp('(?<Fname>.*\\.)(S(?<se>\\d{1,2})E(?<ep>\\d{2,3}).*|(?<season>S\\d{1,2}-S\\d{2,3}).*|(?<yr>\\d{4}[^p]).*)', 'g') const str = `Westworld.S04E05.720p.WEB.h264-KOGi[rarbg] Westworld.S04E04.1080p.WEB.H264-CAKES[rarbg] For.All.Mankind.S03E08.720p.WEB.h264-KOGi[rarbg] Talk.to.Me.2022.1080p.WEBRip.DD5.1.x264-LAMA Jules.2023.1080p.AMZN.WEBRip.DD5.1.x264-LAMA 90.Day.Fiance.UK.S02E12.1080p.HEVC.x265-MeGusta Inside.Job.S01-S02.WEBRip.1080p.AAC5.1.x265-SiQ Til Death Do Us Part 2023 1080p AMZN WEBRip DD5 1 x264-LAMA UFC.Fight.Night.227.Grasso.vs.Shevchenko.2.WEB-DL.H264.Fight-BB[TGx] mIRC does not allow you to retrieve the full match. You can access simple captures but *you cannot access named capture* Well dam, now what? ***Work in progress*** \$replace(\$1-,\$chr(32),\$chr(46)) ;mIRC Alias to test alias test1 { ;TV ;var %s Westworld.S04E05.720p.WEB.h264-KOGi[rarbg] ;TV Series ;var %s Inside.Job.S01-S02.WEBRip.1080p.AAC5.1.x265-SiQ ;Movie var %s A.Million.Miles.Away.2023.1080p.AMZN.WEBRip.DD5.1.x264-LAMA noop \$regex(name, %s,/(?<Fname>.*\\.)(S(?<se>\\d{1,2})E(?<ep>\\d{2,3}).*|(?<season>S\\d{1,2}-S\\d{2,3}).*|(?<yr>\\d{4}[^p]).*)/g) if (\$len(\$regml(name,3)) == 5) { Echo -a Movie: Fn: \$regml(name,1) Year: \$regml(name,3) | halt } if (-s isin %s) { Echo -a Series: Fn: \$regml(name,1) S: \$regml(name,3) } else echo -a TV: Fn: \$regml(name,1) S: \$regml(name,3) EP: \$regml(name,4) } ;mIRC 7zip stuff var %eDir \$getdir(.tar) var %oDir \$getdir_Movies /run -np "c:\\Program files\\7-Zip\\7z.exe" e -aos " \$+ %eDir \$+ %s \$+ " *.avi *.mkv *.mp4 -r -o \$+ " \$+ %oDir \$+ "`; // 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