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

/
/
g

Test String

Code Generator

Language

Generated Code

use strict; my $str = '2018-04-16T08:09:27.203Z cae70dd2-414c-11e8-836a-354cb4985a41 https 2018-04-15T01:20:31.092381Z app/MBM-L-Publi-V9D386A91UNR/4695f2e72859f540 128.121.50.133:59367 10.0.1.14:80 0.001 0.003 0.000 200 200 934 282 "GET https://www.domain.tld:443/__utm.gif?v=1&_v=j66&a=1866784098&t=pageview&_s=1&dl=https%3A%2F%2Fwww.domain.tld%2Fnews%2Farchived%2Fresources-archived%22001-11%2F&ul=en-us&de=UTF-8&dt=Racal%20reborn%20after%20Thales%20buyout&sd=24-bit&sr=412x732&vp=404x732&je=0&cid=1296878891.1495497600&_gid=1908154735.1495497600&_r=1&z=821631926 HTTP/1.1" "Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)" ECDHE-RSA-AES128-GCM-SHA256 TLSv1.2 arn:aws:elasticloadbalancing:eu-west-2:123456789012:targetgroup/MBM-L-Cache-1LH0DNU489D55/167e4810f75804c3 "Root=1-5ad2a8df-021aaad5031047e7dec3f2fa" "www.domain.tld" "arn:aws:acm:eu-west-2:123456789012:certificate/1140cbb2-4d4f-44b0-a4d9-a79329c5e361" 0'; my $regex = qr/"[^"]*"|\S+/p; if ( $str =~ /$regex/g ) { print "Whole match is ${^MATCH} and its start/end positions can be obtained via \$-[0] and \$+[0]\n"; # print "Capture Group 1 is $1 and its start/end positions can be obtained via \$-[1] and \$+[1]\n"; # print "Capture Group 2 is $2 ... and so on\n"; } # ${^POSTMATCH} and ${^PREMATCH} are also available with the use of '/p' # Named capture groups can be called via $+{name}

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 Perl, please visit: http://perldoc.perl.org/perlre.html