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 (1)

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 = /([0-9]{1,2}[\/][0-9]{1,2}[\/][0-9]{1,4}) ([0-9]{1,2}:[0-9]{1,2}) - ([a-z0-9 \S]+?:)([a-z0-9 \S]+?\n)/g; // Alternative syntax using RegExp constructor // const regex = new RegExp('([0-9]{1,2}[\\\/][0-9]{1,2}[\\\/][0-9]{1,4}) ([0-9]{1,2}:[0-9]{1,2}) - ([a-z0-9 \\S]+?:)([a-z0-9 \\S]+?\\n)', 'g') const str = `25/03/2017 09:32 - ‎Diego Rhoger criou o grupo "CerradoValley" 27/04/2017 15:42 - Você entrou usando o link de convite deste grupo 27/04/2017 15:43 - +55 61 9332-2990: Valeu 👍🏻 27/04/2017 15:43 - Fabiano S Figueiredo: 🙃👍 27/04/2017 15:43 - ‎Dartagnan Sabino Antunes Oliveira entrou usando o link de convite deste grupo 27/04/2017 15:44 - Fabiano S Figueiredo: e aí gente, tudo bem? 27/04/2017 15:44 - Fabiano S Figueiredo: Onde e como saber quem é quem? :D 27/04/2017 15:44 - +55 61 9332-2990: No decorrer das conversas vc vai conhecendo o pessoal rs 27/04/2017 15:45 - Fabiano S Figueiredo: né? :) 27/04/2017 15:45 - +55 61 9869-0018: é a única forma 27/04/2017 15:45 - +55 61 9869-0018: e ir aos meetups da vida 27/04/2017 15:46 - Fabiano S Figueiredo: Jóia. E normalmente o que é discutido aqui? 27/04/2017 15:55 - +55 61 9332-2990: Discutimos sobre mercado, economia, startups, comportamento empreendedor 27/04/2017 15:55 - +55 61 9332-2990: E as vezes a gente se espanca em assuntos de religiao e política 27/04/2017 15:55 - +55 61 9332-2990: As tudo fica bem depois 27/04/2017 15:56 - Fabiano S Figueiredo: Massa!! 27/04/2017 15:56 - +55 61 9332-2990: @556181302875 apresenta aí sua startup cara com poucas palavras 27/04/2017 15:56 - Fabiano S Figueiredo: Legal!! 27/04/2017 15:56 - +55 61 9332-2990: E manda o vídeo tbm rs 27/04/2017 15:56 - +55 61 9332-2990: Bota aí pra colher a opinião da gakera 27/04/2017 15:57 - +55 61 9332-2990: A minha vc já tem 👍🏻 27/04/2017 15:57 - Fabiano S Figueiredo: Qual é a do Vídeo? 27/04/2017 15:57 - +55 61 9332-2990: É pro @556181302875 rs 27/04/2017 15:57 - Fabiano S Figueiredo: Ahh!! ups! 27/04/2017 16:01 - Dartagnan Sabino Antunes Oliveira: Boa tarde Galera! Sou o Dartagnan, analista e desenvolvedor de sistemas. `; // 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