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

/
/
i

Test String

Code Generator

Language

Generated Code

import Foundation let pattern = #"\n\s\sname:\sI_LOGON_AUTH_FAILED\n[\s\S]*?\s\ssession\n[\s\S]*?\s\s\s\sremoteAddress:\s(?<ipaddress>.*?):[0-9]*\n[\s\S]*?\s\sauthentication\n[\s\S]*?\s\s\s\suserName:\s(?<username>.*)"# let regex = try! NSRegularExpression(pattern: pattern, options: .caseInsensitive) let testString = #""" event time: 2021-11-23 22:42:59.164039 +0300 app: BvSshServer 8.49 name: I_LOGON_AUTH_FAILED desc: User authentication failed. session id: 1015 service: SSH remoteAddress: 192.168.0.103:41104 authentication attemptNr: 1 serialize: completion userName: userTest method: keyboard-interactive submethod: Password windowsAccount: DESKTOP-FN3LTFE\paprikar parameters failureReason: BadCredentials help message: Unknown user name or incorrect password. """# let stringRange = NSRange(location: 0, length: testString.utf16.count) if let firstMatch = regex.firstMatch(in: testString, range: stringRange) { let result: [String] = (1 ..< firstMatch.numberOfRanges).map { (testString as NSString).substring(with: firstMatch.range(at: $0)) } print(result) } else { print("No matches were found.") }

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