Regular Expressions 101

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  • 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"
"
gm

Test String

Code Generator

Language

Generated Code

import Foundation let pattern = #"'name': (['\"])(.*?)\1, 'awardedAt': (-?\d+),"# let regex = try! NSRegularExpression(pattern: pattern, options: .anchorsMatchLines) let testString = #""" [{'name': 'Locus Award', 'awardedAt': 1230796800000, 'category': 'Best Young Adult Book', 'hasWon': None}, {'name': 'Georgia Peach Book Award', 'awardedAt': 1230796800000, 'category': '', 'hasWon': None}, {'name': 'Buxtehuder Bulle', 'awardedAt': 1230796800000, 'category': None, 'hasWon': None}, {'name': 'Golden Duck Award', 'awardedAt': 1230796800000, 'category': 'Young Adult (Hal Clement Award)', 'hasWon': None}, {'name': "Grand Prix de l'Imaginaire", 'awardedAt': 1262332800000, 'category': 'Roman jeunesse étranger', 'hasWon': None}, {'name': 'Books I Loved Best Yearly (BILBY) Awards', 'awardedAt': 1325404800000, 'category': 'Older Readers', 'hasWon': None}, {'name': "West Australian Young Readers' Book Award (WAYRBA)", 'awardedAt': 1262332800000, 'category': 'Older Readers', 'hasWon': None}, {'name': "Red House Children's Book Award", 'awardedAt': 1262332800000, 'category': 'Older Readers & Overall', 'hasWon': None}, {'name': 'South Carolina Book Award', 'awardedAt': 1293868800000, 'category': 'Junior and Young Adult Book', 'hasWon': None}, {'name': 'Charlotte Award', 'awardedAt': 1262332800000, 'category': None, 'hasWon': None}, {'name': 'Colorado Blue Spruce Young Adult Book Award', 'awardedAt': 1262332800000, 'category': None, 'hasWon': None}, {'name': 'Teen Buckeye Book Award', 'awardedAt': 1230796800000, 'category': None, 'hasWon': None}, {'name': "Pennsylvania Young Readers' Choice Award", 'awardedAt': 1262332800000, 'category': 'Young Adults', 'hasWon': None}, {'name': 'Rhode Island Teen Book Award', 'awardedAt': 1262332800000, 'category': None, 'hasWon': None}, {'name': 'Vermont Golden Dome Book Award', 'awardedAt': 1262332800000, 'category': None, 'hasWon': None}, {'name': 'Evergreen Teen Book Award', 'awardedAt': 1293868800000, 'category': None, 'hasWon': None}, {'name': 'Soaring Eagle Book Award', 'awardedAt': 1230796800000, 'category': None, 'hasWon': None}, {'name': 'Milwaukee County Teen Book Award', 'awardedAt': 1262332800000, 'category': '', 'hasWon': None}, {'name': 'Sakura Medal', 'awardedAt': 1262332800000, 'category': 'Middle School Book', 'hasWon': None}, {'name': 'Michigan Library Association Thumbs Up! Award', 'awardedAt': 1230796800000, 'category': None, 'hasWon': None}, {'name': 'Florida Teens Read', 'awardedAt': 1230796800000, 'category': None, 'hasWon': None}, {'name': 'Deutscher Jugendliteraturpreis', 'awardedAt': 1262332800000, 'category': 'Preis der Jugendjury', 'hasWon': None}, {'name': 'Iowa High School Book Award', 'awardedAt': 1293868800000, 'category': '', 'hasWon': None}, {'name': 'New Mexico Land of Enchantment Award', 'awardedAt': 1293868800000, 'category': 'Young Adult', 'hasWon': None}, {'name': 'Eliot Rosewater Indiana High School Book Award', 'awardedAt': 1262332800000, 'category': None, 'hasWon': None}, {'name': 'The Inky Awards', 'awardedAt': 1230796800000, 'category': 'Silver Inky', 'hasWon': None}, {'name': 'California Young Readers Medal', 'awardedAt': 1293868800000, 'category': 'Young Adult', 'hasWon': None}, {'name': 'Lincoln Award', 'awardedAt': 1293868800000, 'category': '', 'hasWon': None}, {'name': 'Kinderboekwinkelprijs', 'awardedAt': 1262332800000, 'category': '', 'hasWon': None}, {'name': 'Truman Readers Award', 'awardedAt': 1293868800000, 'category': None, 'hasWon': None}, {'name': 'CYBILS Award', 'awardedAt': 1199174400000, 'category': 'Young Adult Fantasy & Science Fiction', 'hasWon': None}, {'name': 'Literaturpreis der Jury der jungen Leser', 'awardedAt': 1262332800000, 'category': 'Jugendbuch', 'hasWon': None}, {'name': 'The Inky Awards Shortlist', 'awardedAt': 1230796800000, 'category': 'Silver Inky', 'hasWon': None}, {'name': 'Prix Et-lisez-moi', 'awardedAt': 1293868800000, 'category': None, 'hasWon': None}, {'name': 'Gateway Readers Award', 'awardedAt': 1293868800000, 'category': None, 'hasWon': None}, {'name': 'Oklahoma Sequoyah Award', 'awardedAt': 1293868800000, 'category': 'High School and Intermediate', 'hasWon': None}, {'name': 'Premio El Templo de las Mil Puertas', 'awardedAt': 1230796800000, 'category': 'Mejor novela extranjera perteneciente a saga', 'hasWon': None}, {'name': "Rebecca Caudill Young Readers' Book Award", 'awardedAt': 1293868800000, 'category': None, 'hasWon': None}, {'name': 'LovelyBooks Leserpreis', 'awardedAt': 1230796800000, 'category': 'Fantasy', 'hasWon': None}, {'name': 'LovelyBooks Leserpreis for Bestes Cover/Umschlag', 'awardedAt': 1230796800000, 'category': None, 'hasWon': None}, {'name': 'Premi Protagonista Jove', 'awardedAt': 1230796800000, 'category': 'Categoria 12-14 anys', 'hasWon': None}] """# 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