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

Code Generator

Language

Generated Code

import Foundation let pattern = #"^REMARK[^\r\n]+([\r\n]+)@ID"# let regex = try! NSRegularExpression(pattern: pattern, options: .anchorsMatchLines) let testString = #""" [HLIST F.PROTOCOL @ID PROTOCOL.ID PROCESS.DATE TIME.MSECS K.USER APPLICATION LEVEL.FUNCTION ID REMARK PAGE 1 11:34:02 23 NOV 2023 @ID............ 202309260081340532.21 @ID............ 202309260081340532.21 PROTOCOL.ID.... 202309260081340532.21 PROCESS.DATE... 20230926 TIME.MSECS..... 11:15:32:934 K.USER......... INPUTTER APPLICATION.... AC.INWARD.ENTRY LEVEL.FUNCTION. 1 ID............. REMARK......... ENQUIRY - AC.INTERFACE.REPORT @ID............ 202309260081340523.16 @ID............ 202309260081340523.16 PROTOCOL.ID.... 202309260081340523.16 PROCESS.DATE... 20230926 TIME.MSECS..... 11:15:23:649 K.USER......... INPUTTER APPLICATION.... AC.INWARD.ENTRY LEVEL.FUNCTION. 1 ID............. REMARK......... ENQUIRY - AC.INTERFACE.REPORT @ID............ 202309260081340465.12 @ID............ 202309260081340465.12 PROTOCOL.ID.... 202309260081340465.12 PROCESS.DATE... 20230926 TIME.MSECS..... 11:14:25:781 K.USER......... INPUTTER APPLICATION.... AC.INWARD.ENTRY LEVEL.FUNCTION. 1 ID............. REMARK......... ENQUIRY - AC.INTERFACE.REPORT @ID............ AUTHORISER-8232 @ID............ AUTHORISER-8232 PROTOCOL.ID.... AUTHORISER-8232 PROCESS.DATE... 20230926 TIME.MSECS..... 09:08:19:962 K.USER......... AUTHORISER APPLICATION.... PGM.BREAK LEVEL.FUNCTION. 1 ID............. LIST F.PROTOCOL @ID PROTOCOL.ID PROCESS.DATE TIME.MSECS K.USER APPLICATION LEVEL.FUNCTION ID REMARK PAGE 2 11:34:02 23 NOV 2023 REMARK......... @ID............ 202309260081340530.06 @ID............ 202309260081340530.06 PROTOCOL.ID.... 202309260081340530.06 PROCESS.DATE... 20230926 TIME.MSECS..... 11:15:30:223 K.USER......... INPUTTER APPLICATION.... AC.INWARD.ENTRY LEVEL.FUNCTION. 1 ID............. REMARK......... ENQUIRY - AC.INTERFACE.REPORT @ID............ 202309269535047401.01 @ID............ 202309269535047401.01 PROTOCOL.ID.... 202309269535047401.01 PROCESS.DATE... 20230926 TIME.MSECS..... 13:10:01:201 K.USER......... INPUTTER APPLICATION.... DRAWINGS LEVEL.FUNCTION. 1 I ID............. REMARK......... @ID............ 202309260081340469.10 @ID............ 202309260081340469.10 PROTOCOL.ID.... 202309260081340469.10 PROCESS.DATE... 20230926 TIME.MSECS..... 11:14:29:654 K.USER......... INPUTTER APPLICATION.... AC.INWARD.ENTRY LEVEL.FUNCTION. 1 ID............. REMARK......... ENQUIRY - AC.INTERFACE.REPORT @ID............ 202309260081340490.06 @ID............ 202309260081340490.06 PROTOCOL.ID.... 202309260081340490.06 PROCESS.DATE... 20230926 TIME.MSECS..... 11:14:50:299 K.USER......... INPUTTER APPLICATION.... AC.INWARD.ENTRY LIST F.PROTOCOL @ID PROTOCOL.ID PROCESS.DATE TIME.MSECS K.USER APPLICATION LEVEL.FUNCTION ID REMARK PAGE 3 11:34:02 23 NOV 2023 LEVEL.FUNCTION. 1 ID............. REMARK......... ENQUIRY - AC.INTERFACE.REPORT @ID............ 202309260081340509.05 @ID............ 202309260081340509.05 PROTOCOL.ID.... 202309260081340509.05 PROCESS.DATE... 20230926 TIME.MSECS..... 11:15:09:201 K.USER......... INPUTTER APPLICATION.... AC.INWARD.ENTRY LEVEL.FUNCTION. 1 ID............. REMARK......... ENQUIRY - AC.INTERFACE.REPORT @ID............ 202309260081340529.00 @ID............ 202309260081340529.00 PROTOCOL.ID.... 202309260081340529.00 PROCESS.DATE... 20230926 TIME.MSECS..... 11:15:29:015 K.USER......... INPUTTER APPLICATION.... AC.INWARD.ENTRY LEVEL.FUNCTION. 1 ID............. REMARK......... ENQUIRY - AC.INTERFACE.REPORT @ID............ 202310033834745376.01 @ID............ 202310033834745376.01 PROTOCOL.ID.... 202310033834745376.01 PROCESS.DATE... 20230926 TIME.MSECS..... 12:36:16:380 K.USER......... ASHWIN.KUMAR APPLICATION.... CATEGORY LEVEL.FUNCTION. 1 S ID............. REMARK......... @ID............ 202309260081340496.06 @ID............ 202309260081340496.06 PROTOCOL.ID.... 202309260081340496.06 PROCESS.DATE... 20230926 TIME.MSECS..... 11:14:56:370 LIST F.PROTOCOL @ID PROTOCOL.ID PROCESS.DATE TIME.MSECS K.USER APPLICATION LEVEL.FUNCTION ID REMARK PAGE 4 11:34:02 23 NOV 2023 K.USER......... INPUTTER APPLICATION.... AC.INWARD.ENTRY LEVEL.FUNCTION. 1 ID............. REMARK......... ENQUIRY - AC.INTERFACE.REPORT @ID............ 202310031395145227.00 @ID............ 202310031395145227.00 PROTOCOL.ID.... 202310031395145227.00 PROCESS.DATE... 20230926 TIME.MSECS..... 12:33:47:173 K.USER......... ASHWIN.KUMAR APPLICATION.... SIGN.ON LEVEL.FUNCTION. ID............. REMARK......... @ID............ TEST1-70226 @ID............ TEST1-70226 PROTOCOL.ID.... TEST1-70226 PROCESS.DATE... 20230926 TIME.MSECS..... 12:52:55:808 K.USER......... TEST1 APPLICATION.... PGM.BREAK LEVEL.FUNCTION. 1 ID............. REMARK......... @ID............ 202309264115451975.00 @ID............ 202309264115451975.00 PROTOCOL.ID.... 202309264115451975.00 PROCESS.DATE... 20230926 TIME.MSECS..... 14:26:15:315 K.USER......... INPUTTER APPLICATION.... ENQUIRY.SELECT LEVEL.FUNCTION. 1 ID............. TRADE.POS.VALUATION_BH0010001_INPUTTER REMARK......... 1 """# 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