Regular Expressions 101

Save & Manage Regex

  • Current Version: 1
  • Save & Share
  • Community Library

Flavor

  • PCRE2 (PHP)
  • ECMAScript (JavaScript)
  • Python
  • Golang
  • Java
  • .NET 7.0 (C#)
  • Rust
  • PCRE (Legacy)
  • Regex Flavor Guide

Function

  • Match
  • Substitution
  • List
  • Unit Tests
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
Processing...

Test String

Code Generator

Language

Generated Code

import re regex = re.compile(r"(?:demande|incident).*(?'num_externe'INC[0-9]*).*(?:\n.*)*Nom\s*:\s*(?'ins_libl'.*\)).*(?:\n.*)*Ville\s*:\s*(?'apt_localisation'.*?)\s*(?:\n.*)*-\s*Demandeur\s*:\s*(?'apt_nom'.*?,.*?),(?'apt_telephone'.*?),.*(?:\n.*)*Cat.gorie\s*:\s*(?'tsy_lib'.*?)\s*(?:\n.*)*\s*-.*Description.*?:\s*(?:\n.*)*\s*o\s*(?'commentaire_externe'.*?)\s*\n", flags=re.MULTILINE) test_str = ("<![CDATA[ Bonjour, \n" " \n" " La facture proforma de la demande n°INC0937639 a été mise à jour Pour accéder à ce dossier de nature &quot; demande &quot;, cliquer ici . \n" " Détail des informations : \n" " - Date de création : 21/03/2019 15:51:54 \n" " - Site concerné : \n" " o Nom : RRAA COURS LA VILLE (00363800) \n" " o Etage : \n" " o Bureau : \n" " o Adresse 1 : 55 RUE GEORGES CLEMENCEAU \n" " o Adresse 2 : \n" " o Ville : COURS LA VILLE \n" " o CP : 69470 \n" " o Téléphone : 0474647881 \n" " o Fax : 0474647888 \n" " - Horaires du site : \n" " o Statut : Ouvert LP : BERNARD,franck Lu=Fermé Fermé Ma=08H30-12H00 13H30-17H45 Me=08H30-12H00 13H30-17H45 Je=08H30-12H00 14H15-17H45 Ve=08H30-12H00 13H30-17H45 Sa=08H30-12H00 Fermé Di=Fermé Fermé \n" " - Demandeur : FILLON,LOREN,0474647881, \n" " - Logisticien : \n" " o Monsieur BERNARD, franck \n" " - Equipe d'affectation :LP \n" " - Intervenant : BERNARD franck \n" " - Catégorie : MULTITECHNIQUE\\Petits travaux\\Menuiserie \n" " - Description du dossier : \n" " o Pose d'une plaque pour boucher l'ouverture sur la boite aux lettres bureau RA \n" " \n" " Pour accéder à ce dossier, cliquer ici . \n" " ]]>\n") matches = regex.finditer(test_str) for match_num, match in enumerate(matches, start=1): print(f"Match {match_num} was found at {match.start()}-{match.end()}: {match.group()}") for group_num, group in enumerate(match.groups(), start=1): print(f"Group {group_num} found at {match.start(group_num)}-{match.end(group_num)}: {group}")

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