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

# coding=utf8 # the above tag defines encoding for this document and is for Python 2.x compatibility import re regex = r"(baulera|guardamuebles)" test_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). //\n") matches = re.finditer(regex, test_str, re.MULTILINE | re.IGNORECASE) for matchNum, match in enumerate(matches, start=1): print ("Match {matchNum} was found at {start}-{end}: {match}".format(matchNum = matchNum, start = match.start(), end = match.end(), match = match.group())) for groupNum in range(0, len(match.groups())): groupNum = groupNum + 1 print ("Group {groupNum} found at {start}-{end}: {group}".format(groupNum = groupNum, start = match.start(groupNum), end = match.end(groupNum), group = match.group(groupNum))) # Note: for Python 2.7 compatibility, use ur"" to prefix the regex and u"" to prefix the test string and substitution.

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 Python, please visit: https://docs.python.org/3/library/re.html