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

r"
"
gm

Test String

Code Generator

Language

Generated Code

import Foundation let pattern = #"\b(?:DE|AT)(?:\s?[0-9a-zA-Z]){18}(?:(?:\s?[0-9a-zA-Z]){2})?\b"# let regex = try! NSRegularExpression(pattern: pattern, options: .anchorsMatchLines) let testString = ###################""" ################## Germany IBAN ################## DE89 3704 0044 0532 0130 00 DE59290501010001149590 DE62500105179628448387 DE55500105172374652131 DE50500105176152274153 DE 0712 3412 3412 3412 3412 DE07 1234 1234 1234 1234 12 DE07 1234 1234 1234 123412 Mashine friendly DE07123412341234123412 style This format DE07 1234 1234 1234 1234 12 is given by DIN Human DE07 1234 1234 1234 123412 readable Not good DE07 12341234 1234123412 readable ################## Austrian IBAN ################## AT61 1904 3002 3457 3201 AT59290501010001149590 AT62500105179628448387 AT55500105172374652131 AT50500105176152274153 AT 0712 3412 3412 3412 3412 AT07 1234 1234 1234 1234 12 AT07 1234 1234 1234 123412 Mashine friendly AT07123412341234123412 style This format AT07 1234 1234 1234 1234 12 is given by DIN Human AT07 1234 1234 1234 123412 readable Not good AT07 12341234 1234123412 readable """################### 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