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

r"
"

Test String

Code Generator

Language

Generated Code

const regex = new RegExp('CAT:"((?:[^\\"]+|\\\\.)*)"', '') const str = `adlo2gc01-adinbcgw01-16-04-28-12_37_20_1461847501.log:1464846761.422 184 10.221.251.213 TCP_NC_MISS/200 312 GET http://nqs-u33-gc2.redacted.com/ping?time=27.50399999995716&pingTime=5&totalBytes=334203&dataType=0&code=U_19160_3m2x9n8t2tywsyus&diffTime=5335 HTTP/1.1 userid -/nqs-usc1-gc2.redacted.com text/plain http://www.moon.com/audio Mozilla/5.0%20(Windows%20NT%206.1;%20WOW64)%20AppleWebKit/537.36%20(KHTML,%20like%20Gecko)%20Chrome/49.0.2623.112%20Safari/537.36 - --- OIP:114.155.103.27 AIP:215.74.50.9:8882 CAT:"Business Economy" NSL:0 OCT:27 ORT:60 XFF:11.51.42.169 PSP:52135 732 SSL-C:none SSL-V:- XVID:-`; // Reset `lastIndex` if this regex is defined globally // regex.lastIndex = 0; let m; if ((m = regex.exec(str)) !== null) { // 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