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
  • Match everything enclosed
    (?:...)
  • Capture everything enclosed
    (...)
  • 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

/
/
mgxi

Test String

Code Generator

Generated Code

import Foundation let pattern = ##""" ^((?<ShowNameA>.*[^ (_.]) [ (_.]+ (?!720p|1080p|264|265) ( # Shows with preceding Year #(?<ShowYearA>\d{4}) ([ (_.]+ ( (?<ShowYearA>(?:19|20)\d{2}) ([ (_.]+ ( (?<SeasonA>\d{1,2})x(?<EpisodeA>\d{1,2}) |(?<SeasonB>[0-3]?[0-9])(?<EpisodeB>\d{2}) |S(?<SeasonC>\d{1,2})E(?<EpisodeC>\d{1,2}) ) )? | # Shows without preceding Year (?<!\d{4})( S(?<SeasonD>\d{1,2})E(?<EpisodeD>\d{1,2}) |(?<SeasonF>[0-3]?[0-9])(?<EpisodeF>\d{2}) |(?<SeasonE>\d{1,2})x(?<EpisodeE>\d{1,2})) ) |(?<ShowNameB>.+)) """## let regex = try! NSRegularExpression(pattern: pattern, options: [.anchorsMatchLines, .caseInsensitive, .allowCommentsAndWhitespace]) let testString = #""" 666.Park.Avenue.S01E04.HDTV.x264-LOL.[VTV].mp4 Rick and Morty S01E01 - Pilot [1080p] [h.265].mkv The.4400.204.mkv The Flash (2014) - S01E05 - City of Heroes family.guy.1316.hdtv-lol.mp4 castle.2009.722.hdtv-lol.mp4 Orange.Is.The.New.Black.S01E01.720p.WEBRip.AAC2.0.H.264-Abjex.mkv Top.Gear.2013.20x03.720p.HDTV.x264-FoV.mkv archer.2009.S04E13 louie.506.hdtv-lol.mp4 Sense8.S01E05.Art.Is.Like.Religion.WEBRip.x264-SNEAkY.mp4 The.Leftovers.S01E03.HDTV.x264-KILLERS.mp4 space 1999 1975 Top.Gear.20x03.720p.HDTV.x264-FoV.mkv Space: 1999 (1975) Space.1999.1975.S01E01 marvels.agents.of.s.h.i.e.l.d.s01e13.720p.hdtv.x264-killers.mkv Supernatural.S10E12.720p.HDTV.X264-DIMENSION.mkv 12.Monkeys.S01E09.720p.HDTV.x264-KILLERS.mkv space 1999.(1975) Space.1999.S01E01 v.2009.S01E13.the.title.avi Teen.wolf.S04E12.HDTV.x264 The Newsroom 2X04 Conseguenze Indesiderate ITA ENG BDMux -iGM+GiuseppeTnT mkv Continuum S04E01 Lost Hours -LGC mkv Royal Pains S07E04 HEVC piemonster mkv Sense8.S01E05.Art.Is.Like.Religion.WEBRip.x264-SNEAkY.mp4 Family.Guy.S11.Special-200.Episodes.Later.720p.HDTV.X264-DIMENSION """# 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