Regular Expressions 101

Save & Share

  • Regex Version: ver. 2
  • Update Regex
    ctrl+⇧+s
  • Save new Regex
    ctrl+s
  • Add to Community Library

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

package main import ( "regexp" "fmt" ) func main() { var re = regexp.MustCompile(`(?m)\?sciper=([0-9]{1,})[^0-9]>(.*?)<\/a>`) var str = `<!-- ceci est une version anonymisée de https://cadiwww.epfl.ch/listes?groupe=epfl-dojo --> <html> <head> <title>Liste <a href="mailto:noreply@epfl.ch">noreply@epfl.ch</a> (15 personnes) :</title> <link rel="stylesheet" href="https://www.epfl.ch/styles/dynastyle.php" media="screen"> </head> <body bgcolor="white"> <h3>Liste <a href="mailto:noreply@epfl.ch">noreply@epfl.ch</a> (15 personnes) :</h3> <ul> <a href="/listes?sciper=162141">Prentice Anna</a><br> <a href="/listes?sciper=191824">Reuben Katy</a><br> <a href="/listes?sciper=117417">Jodi Edwige</a><br> <a href="/listes?sciper=183535">Roger Gaétane</a><br> <a href="/listes?sciper=177895">James Laurent</a><br> <a href="/listes?sciper=127103">Gilmore Jean-Daniel</a><br> <a href="/listes?sciper=169419">Thorpe Nicolas</a><br> <a href="/listes?sciper=184984">Parris Billie-Jo</a><br> <a href="/listes?sciper=183672">Horner Barbara</a><br> <a href="/listes?sciper=152148">Daniels Moïse</a><br> <a href="/listes?sciper=157966">Lott Noah</a><br> <a href="/listes?sciper=174223">Ester Polly</a><br> <a href="/listes?sciper=162990">Bull Terry</a><br> <a href="/listes?sciper=103088">White E. Pearl</a><br> <a href="/listes?sciper=156713">Peace Warren</a><br> </ul> </body> </html> ` for i, match := range re.FindAllString(str, -1) { fmt.Println(match, "found at index", i) } }

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 Golang, please visit: https://golang.org/pkg/regexp/