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

Code Generator

Language

Generated Code

const regex = /(?P<mesini>\d{2})(?P<diaini>\d{2})(?P<horaini>\d{2})(?P<minini>\d{2})\s(?P<duracaosegundo>\d{5})\s\d{4}\s(\w|\s)\s{6}\s\s(?<rota>(\d{4})|\s{4})\s{6,18}(?<numerob>\d{4})\s(?<ramal>\d{4,8})\s{20,24}(?P<senha>(\d{6}|\s{6}))\s{8}\d{2}\s(?<tronco>(\d{5}|\s{5}))(?<nodetrunk>\d{4})\n/gm; // Alternative syntax using RegExp constructor // const regex = new RegExp('(?P<mesini>\\d{2})(?P<diaini>\\d{2})(?P<horaini>\\d{2})(?P<minini>\\d{2})\\s(?P<duracaosegundo>\\d{5})\\s\\d{4}\\s(\\w|\\s)\\s{6}\\s\\s(?<rota>(\\d{4})|\\s{4})\\s{6,18}(?<numerob>\\d{4})\\s(?<ramal>\\d{4,8})\\s{20,24}(?P<senha>(\\d{6}|\\s{6}))\\s{8}\\d{2}\\s(?<tronco>(\\d{5}|\\s{5}))(?<nodetrunk>\\d{4})\\n', 'gm') const str = `06191520 00102 0000 J 4776 6512 00 4776 06191522 00118 0000 4770 6512 00 024017001 06191535 00037 0000 I 6512 98311871 00 6512 06191532 00000 0000 B 6512 98311871 00 06191529 00141 0000 M 0 2470 999308509 6512 00 002002003 06191555 01854 0000 M 0 2470 33485083 6512 00 002002003 06191655 00151 0000 M 0 2470 01128983434 6512 00 002002003 06191656 00011 0000 M 0 2470 01128983434 6512 00 002002009 06191658 00130 0000 T 0 2470 01128983434 4776 00 002002009 06191701 00137 0000 M 0 2470 01128983434 6512 00 002002009 06191701 00000 0000 0 2470 01128983434 4776 00 002002009 06191632 00034 0000 J 4776 6512 00 4776 06191632 00034 0000 J 4776 6512 00 4776 06191634 00203 0000 T 0 2470 999308509 4776 00 002002001 06191630 00001 0000 J 6361 6512 00 6361 06191630 00001 0000 J 6361 6512 00 6361 06191644 00009 0000 M 0 2470 33283828 6512 00 002002007 06191645 00136 0000 T 0 2470 33283828 4776 00 002002007 06191632 00001 0000 M 0 2470 999308509 6512 00 002002001 06191634 00203 0000 T 0 2470 999308509 4776 00 002002001 06191656 00011 0000 M 0 2470 01128983434 6512 00 002002009 06191658 00130 0000 T 0 2470 01128983434 4776 00 002002009 06191644 00009 0000 M 0 2470 33283828 6512 00 002002007 06191645 00136 0000 T 0 2470 33283828 4776 00 002002007 06191632 00001 0000 M 0 2470 999308509 6512 00 002002001 06191634 00203 0000 T 0 2470 999308509 4776 00 002002001 06191652 00106 0000 M 0 2470 999308509 6512 00 002002003 06191652 00000 0000 0 2470 999308509 6512 00 002002003 06191656 00011 0000 M 0 2470 01128983434 6512 00 002002009 06191658 00130 0000 T 0 2470 01128983434 4776 00 002002009 06191701 00137 0000 M 0 2470 01128983434 6512 00 002002009 06191701 00000 0000 0 2470 01128983434 4776 00 002002009 06220921 00130 0000 M 0 2470 012997319079 6512 00 002002002 06220922 00004 0000 M 0 2470 012997319079 6512 00 002002005 06220924 00157 0000 T 0 2470 012997319079 4776 00 002002005 06220926 00144 0000 M 0 2470 012997319079 6512 00 002002006 06220926 00009 0000 0 2470 012997319079 4776 00 002002006 06220935 00347 0000 M 0 2470 33485083 6512 578129 00 002002001 06220938 00211 0000 M 0 2470 999308509 6512 578129 00 002002002 `; // 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