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

/
/

Test String

Code Generator

Language

Generated Code

use strict; my $str = 'CA9458541531029720 0 Õ  € Q X a j r t „€ ‘ –   JOSEAREVALO6156479343/31/1993F2786386CA Xñ CA9458570739857370 0 Õ¥ MaryjhuneBragado5609341351/17/1982b9356556CA `ñ CA9458570741955170 0 Õ  € R X a j r t „€ ‘ –   jameswalker4331149435/15/1959b9234757CA dñ CA9066056240517090 0 ìÔ  € R U ^ g o q €Œ Ž “  BRIANTIK5458156197/16/1975B3342077CA 4ñ CA9458031025531130 0 íÔ  U [ d m u w ‡€ ’ — ¡ TRINIDADSANTOS5533361392/19/1959N5248608CA 5ñ CA9458292533964780 0 îÔ  € R [ d m u w ‡€‘ “ ˜ ¢ adelagutierrez5548982784/13/1971a8350300CA 6ñ CA9066056290801050 0 ïÔ  S U ^ h p r ‚€‹  ’ œ EDMONDYU57208906011/30/1953N3297882CA 7ñ CA9458292564880620 0 ðÔ  € Q X a j q s ƒ€Œ Ž “  KyleEastman6265480213/15/1990D989010CA 8ñ CA9458292596399750 0 ñÔ  R W ` h p r ‚€  ” ž dianegomez5472938769/7/1963c0290788CA 9ñ CA9066056220118960 0 òÔ  € S X a i q s ƒ€Œ Ž “  ALICIADAVIS5695934389/4/1962C0388640CA :ñ CA9458292520067250 0 óÔ  S Y b j q s ƒ€Ž  • Ÿ BeckiiBarton3098605121/5/1968E787241CA ;ñ CA9066056262386540 0 ôÔ  € R X a k s u …€Œ Ž “  DAVIDFOSTER62122280512/21/1988d6853927CA <ñ CABAZONCA9223095184920980 0 õÔ  S \\ e n v x ˆ€‘ “ ˜ ¢ kelleycarpenter5494747231/22/1962n8892633CA =ñ CA9458292558065680 0 öÔ  € Q U ^ g o q €† ˆ  — carlneal4302148345/10/1971a2722482CA >ñ CA9530720923065470 0 ÷Ô  V ] f o w y ‰€’ ” ™ £ constancedobbins2472191646/22/1966d3711758CA ?ñ CA9458251043273810 0 øÔ  € U Z c l u w ‡€’ ” ™ £ katalinagomez61940050311/3/1989e19556116CA @ñ CA9066056223622510 0 ùÔ  R W ` i q s ƒ€Œ Ž “  BryanKlein6000974524/18/1969F2898009CA Añ CA9458292536237930 0 úÔ  € R [ d l t v †€‘ “ ˜ ¢ davidvelasquez5513188625/2/1965a5657005CA Bñ CA9066056292863440 0 ûÔ  S [ d n v x ˆ€“ • š ¤ MiguelQuintero57135015811/19/1969A4071434CA Cñ CA9066056286159880 0 üÔ  € Q W ` i q s ƒ€Œ Ž “  johnlarson5707996146/14/1967c3807957CA Dñ CA9458392582819850 0 ýÔ  S Z c l t v †€ ‘ –   cherylkovacik3417255601/16/1960C3577212CA Eñ CA9458392573576640 0 þÔ  € Q X a k s u …€ ’ — ¡ SaraTurcios62405747711/21/1984D6159809CA Fñ CA9066056285295550 0 ÿÔ  V ^ g p x z Š€• — œ ¦ GENEVIEVEWILLIAMS5554784895/11/1961N8713815CA Gñ CA9066056278752300 0 Õ  € R Y b l t v †€ ‘ –   dianawhitney56963328110/19/1964c2511736CA Hñ CA9458392582846560 0 Õ  Q U ^ f n p €€‹  ’ œ Rubyrojo5505175434/7/1977b6078175CA Iñ CA9066056266591570 0 Õ  € S Y b k s u …€Œ Ž “  DebbieWallis5521147635/22/1962N8062380CA Jñ CA9223095184920980 0 Õ  T Y b j r t „€ ‘ –   caridadavila5604585905/7/1976b3393184CA Kñ CA9066033324713270 0 Õ  € P T ] e m o €ˆ Š  ™ TomMini5568607044/7/1952E0158545CA Lñ CA9458351055771600 0 Õ  Q V _ h p r ‚€‹  ’ œ JohnCrain5567459788/19/1948R0055874CA Mñ CA9458392520042480 0 Õ  € P T ] g o q €Š Œ ‘ › MANWONG54505011411/30/1962C5674431CA Nñ CA9458351036739820 0 Õ  Q W ` i q s ƒ€Ž  • Ÿ josegarcia6201498175/11/1966c3174253CA Oñ CA9066032333159770 0 Õ  € S W ` i q s ƒ€Œ Ž “  danielsoto6187064407/21/1964b3054964CA Pñ CA9211661989032070 0 Õ  Q Z c l t v †€‘ “ ˜ ¢ kararay craig45539607110/6/1975B5902264CA Qñ'; my $regex = qr/(CA\d{16}).*([A-Za-z0-9].CA) /p; if ( $str =~ /$regex/ ) { 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