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

/
/
gix

Test String

Code Generator

Language

Generated Code

import Foundation let pattern = #"[*][(][\s]*[(\s]*.*[*][)\s]*(.*)\s*[)]\s*=(.*)[\s]*;"# let regex = try! NSRegularExpression(pattern: pattern, options: [.caseInsensitive, .allowCommentsAndWhitespace]) let testString = #""" (*((volatile unsigned short*)(type01_01_06_base + (type01_01_06_offset * 1))) = (unsigned short)(unsigned long)0x01010101); (*((volatile unsigned short*)(type01_01_06_base + (type01_01_06_offset * 2))) = (unsigned short)(unsigned long)0x01000100); (*((volatile unsigned char*)add)) = (unsigned char)data; (*((volatile unsigned short*)add)) = (unsigned short)data; (*((volatile unsigned long*)add)) = (unsigned long)data; *((volatile unsigned char*)0x01010004) = (unsigned char)0x01; *((volatile unsigned char*)0x01010008) = (unsigned char)0x00; *((volatile unsigned short*)0x01020004) = (unsigned short)0x0100; *((volatile unsigned short*)0x01020008) = (unsigned short)0x0000; *((volatile unsigned long*)(0x01030000 + 0x04)) = (unsigned long)0x00010000; *((volatile unsigned long*)(0x01030000 + 0x08)) = (unsigned long)0x00000000; (*((volatile unsigned char*)type01_01_04o_add) = (unsigned char)(unsigned char)0xA5); (*((volatile unsigned char*)type01_01_04n_add) = (unsigned char)(unsigned char)0x5A); (*((volatile unsigned short*)(type01_01_05_base + type01_01_05o_offset)) = (unsigned short)(unsigned short)0x0101); (*((volatile unsigned short*)(type01_01_05_base + type01_01_05n_offset)) = (unsigned short)(unsigned short)0x0100); *((volatile unsigned char*)0x02010004) = (unsigned char)0x04; *((volatile unsigned char*)0x02010008) = (unsigned char)0x05; *((volatile unsigned short*)0x02020004) = (unsigned short)0x0400; *((volatile unsigned short*)0x02020008) = (unsigned short)0x0500; *((volatile unsigned long*)0x02030004) = (unsigned long)(0x00030000 + 0x00010000); *((volatile unsigned long*)0x02030008) = (unsigned long)(0x00030000 + 0x00020000); (*((volatile unsigned char*)0x02040004) = (unsigned char)(unsigned char)(0x0A - 0x02)); (*((volatile unsigned char*)0x02040008) = (unsigned char)(unsigned char)(0x0A - 0x01)); (*((volatile unsigned short*)0x02050004) = (unsigned short)(unsigned short)(0x0001 << 11)); (*((volatile unsigned short*)0x02050008) = (unsigned short)(unsigned short)(0x0001 << 12)); (*((volatile unsigned long*)0x02060004) = (unsigned long)(unsigned long)(0x80000000 | 0x00080000)); (*((volatile unsigned long*)0x02060008) = (unsigned long)(unsigned long)(0x80000000 | 0x00800000)); """# 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