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 = /[[:graph:]]+@[[:graph:]]+\.[[:graph:]]+/gm; // Alternative syntax using RegExp constructor // const regex = new RegExp('[[:graph:]]+@[[:graph:]]+\\.[[:graph:]]+', 'gm') const str = `6x7 456 78993 45528 8382 837372 82 128 8282 82 828282 28 8282635372892 838 Lorem ipsum dolor 335-5555555 sit amet, consectetur adipisci5555555555 elit, sed eiusmod tempor incidunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis 4@4 nostrum exercitationem ullam corporis suscipit laboriosam, nisi ut aliquid e Mario ROSSI x ea commodi Fabio DE LUIGI cons mail@test.com equatur. 3835555555 Quis aute iure reprehenderit in voluptate 555/555555velit esse cillum HOMAWI @dolore eu fugiat nulla pariatur. 43434734 343 3 464 56 @5 65 6 5 757 676 Microsoft Office. Excepteur sint Vaalima obcaecat Digital Forensics 192.168.3.45 cupiditat non RSSNDR74D04A271P proident, sunt in Sabrox bombazzi culpa qui officia de@serunt mollit anim id est laborum. Lorem ipsum Dr.Torsby dolor sit amet, consec 234 546 367 2789 Veldrin tetur adipisci yourken elit,347/5555555 sed eiusm 565437 od tempor incidunt ut labore et Andrea dolore magna aliqua. Ut enim ad minim TELEFUNKEN elin@unita15.no.it FRODENO Jan enim ad minim 555-555555veniam, quis rssndr74d04a271u Zhang YUNING nostrum exercitatio@nem ullam 10.5.6.1corporis Vaalima suscip Wu LEI it laboriosam, nisi ut aliquid ex ea commodi Arael cons@equatur. Quis aute iure r328 5555555 eprehenderit in volup6767676767 6767676767tate 555 555555velit PLANESCAPE esse cillum dolore eu fugiat nulla pariatur. Excepteur sint obcae67676767676767676cat Soul Thosiel rssndr74D04A271U cupidita34567893 t non proident, sunt in culpa qui officia deserunt mollit Abdul-Wahaab Vaalima anim id est laborum. 388.555555 Lorem rSsndr74d04a271u ipsum cinnamomo@cengia.eu dolor sit amet, consectetur adipisci elit, sed Rosa eiusmod tempor Aimar incidunt ut labore et dolore magna a6767676767 32252525 353535 5353535liqua. Ut enim ad minim`; // 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