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

/
/
ig

Test String

Code Generator

Language

Generated Code

import Foundation let pattern = #"\[?(new|evo|bug|wf)(?:[^0-9]{0,5}(?<!op)(?<!op )([0-9]{5,}))? ?-?_?\|?\]? ?"# let regex = try! NSRegularExpression(pattern: pattern, options: .caseInsensitive) let testString = ##""" EVO156484 - ajout avec solde PRI (O/N) EVO158604 - [GC] Ajout gestion type transport hors moisson Evo158595 [676M] - OP19068 Integration factures Immo et Evo158595 [676M] - OP 19068 Integration factures Immo et Evo OP19068 Integration factures Immo et Evo OP 19068 Integration factures Immo et 158595 - 676M - OP19068 Integration factures Immo et creat BUG 160585 Interdire la saisie des temps sur le mois après BUG-[DSN] Implementation bloc 42 pour CVAE BUG153922-[DSN] Resolution pb bloc signataire/creation BUGXXXXXX - [GC] passer entete.zon-int-4 a 0 BUG159220 - En MODEXP si modif Mode reg et mt reg ne BUG - Ensi 159220 et Bug888888 - [EMI] retouche pour le window.close BUG159417 - [GC][MNT157789] Correction controle phyto saisi [DSN][GRH][WF160820] PB sur les libelles des Types et codes Evo157633 - 560- OP19043 - Mise à disposition d'une extract Evo157633 - 560 - OP19043 - Extraction complete de mouvemen BUG|159471|Calcul des % d'avancement totaux facture dièses 160112 TDB3 ajout diese 52 et 53 reste a receptionner et su BUG156820 #43 du type port avec enlevement client chargé qu BUG156820_#43 du type port avec enlevement client chargé qu BUG 153322suite L'engagé est un BTE composé des CDF non réc """## let stringRange = NSRange(location: 0, length: testString.utf16.count) let matches = regex.matches(in: testString, range: stringRange) var result: [[String]] = [] for match in matches { var groups: [String] = [] for rangeIndex in 1 ..< match.numberOfRanges { let nsRange = match.range(at: rangeIndex) guard !NSEqualRanges(nsRange, NSMakeRange(NSNotFound, 0)) else { continue } let string = (testString as NSString).substring(with: nsRange) groups.append(string) } if !groups.isEmpty { result.append(groups) } } print(result)

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 Swift 5.2, please visit: https://developer.apple.com/documentation/foundation/nsregularexpression