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

/
/
gu

Test String

Substitution

Processing...

Code Generator

Language

Generated Code

import Foundation // WARNING: You included a flag that Swift doesn't support: u // When this flag is set, it makes the pattern and subject strings to be treated as unicode. // Swift already treats the pattern and subject strings as unicode by default, so including this flag is redundant. let pattern = #"\W\K(?|(?=(your|her|his|its|our|their|mine|yours|hers|ours|theirs|my|a|an|the)\b)()|(\w+|\*)\b)\s+\b(bore|bade|bit|blew|chose|dove|drew|drove|drank|ate|fell|forbade|forgot|forgave|forsook|froze|got|gave|went|grew|hid|knew|lay|lit|mistook|overdid|overtook|overthrew|rode|rang|rose|saw|shook|shore|shrank|sang|sank|smote|spoke|stole|stank|strod|strove|swore|swam|took|threw|trod|woke|wore|wove|wrote)\b(?=\s)"# let regex = try! NSRegularExpression(pattern: pattern) let testString = #""" 1) And Ôhe spoke to him 2) and spoke to his sons 3) his host, spoke to 4) and took of every 5) and * took a garment 6) And * took * his son 7) merchants fetched a drove of horses 8) ÔI am a rose 9) blossom like a rose 10) But a † rose out 11) that * rose up 12) and a bit 13) and Ôthey bit the people """# let stringRange = NSRange(location: 0, length: testString.utf16.count) let substitutionString = #"$1 - $2 - $3 - "# 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