Regular Expressions 101

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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

/
/
gm

Test String

Substitution

Processing...

Code Generator

Language

Generated Code

import Foundation let pattern = #".*(?<=")(?!US|CN)(?=\w{2}"|").*"# let regex = try! NSRegularExpression(pattern: pattern, options: .anchorsMatchLines) let testString = #""" [ [707860,"UA","Hurzuf"], [519188,"RU","Novinki"], [1283378,"NP","Gorkhā"], [1270260,"IN","State of Haryāna"], [708546,"UA","Holubynka"], [1283710,"NP","Bāgmatī Zone"], [529334,"RU","Mar’ina Roshcha"], [529334,"US","Mar’ina Roshcha"], [6255149,"","North America"], [1269750,"IN","Republic of India"], [1283240,"NP","Kathmandu"], [703363,"UA","Laspi"], [3632308,"VE","Merida"], [473537,"CN","Vinogradovo"], [473537,"RU","Vinogradovo"], [384848,"IQ","Qarah Gawl al ‘Ulyā"], [569143,"RU","Cherkizovo"], [713514,"UA","Alupka"], [2878044,"DE","Lichtenrade"], ] """# let stringRange = NSRange(location: 0, length: testString.utf16.count) let substitutionString = #""# let result = regex.stringByReplacingMatches(in: testString, range: stringRange, withTemplate: substitutionString) 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