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"
"
gmi

Test String

Code Generator

Language

Generated Code

use strict; my $str = 'DEPARTAMENTO DE CATEGORIA EN EXCELENTE ESTADO EN BELGRANO //4 AMBIENTES CON COCHERA, DEPENDENCIA DE SERVICIO Y BAULERA /MUY LUMINOSO, PISO ALTO, CON VISTA ABIERTA / COMODO, SILENCIOSO, EXCELENTE DISTRIBUCION / TODOS LOS AMBIENTES DAN AL EXTERIOR /EDIFICIO EN TORRE CON SEGURIDAD LAS 24HS / AMPLIO ESPACIO VERDE PARA DISPERSION Y JUEGOS PARA NIÑOS / EDIFICIO DE 25 PISOS / SEMIPISOS /JOSE HERNANDEZ AL 2000, ENTRE O\'HIGGINS Y ARCOS //PISO: 8vo, AL FRENTE, ORIENTACION NORESTE //VALOR DE VENTA: U$S 450.000 //EXPENSAS: $15.500 / SUPERFICIE TOTAL: 144M2 /SUPERFICIE CUBIERTA: 134 M2 + BALCONES /AMPLIO LIVING COMEDOR /3 DORMITORIOS, EL PRINCIPAL EN SUITE / 2DO BAÑO COMPLETO /GRAN COCINA - COMEDOR / LAVADERO /DEPENDENCIA DE SERVICIO (CON SU RESPECTIVO BAÑO) / 2 BALCONES /BAULERA AMPLIA /COCHERA CUBIERTA Y FIJA / CALEFACCION POR LOSA RADIANTE / MUY BUENA UBICACIÓN: CERCANO A LAS AVENIDAS CABILDO, DEL LIBERTADOR, LUIS MARIA CAMPOS, JURAMENTO Y FEDERICO LACROZE. CERCANIA A ESPACIOS VERDES (BARRANCAS DE BELGRANO Y PLAZA MANUEL BELGRANO). ZONA COMERCIAL (A POCAS CUADRAS DE CABILDO Y JURAMENTO) Y DE COLEGIOS. A POCAS CUADRAS DEL SOLAR DE LA ABADIA Y DEL HOSPITAL MILITAR.CON MÚLTIPLES MEDIOS DE TRANSPORTE: INCLUIDO CERCANIA AL SUBTE LINEA "D" (ESTACIÓN JOSE HERNANDEZ) Y EL FC. MITRE (ESTACIÓN BELGRANO C). // '; my $regex = qr/(baulera|guardamuebles)/mip; 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