import Foundation
let pattern = #"^(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9][0-9]|[0-9]), (25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9][0-9]|[0-9]), (25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9][0-9]|[0-9])$"#
let regex = try! NSRegularExpression(pattern: pattern, options: .anchorsMatchLines)
let testString = #"""
Strings with negative numbers do not match. Leading
0's do not match, except when a number is 0.
0, 0, 0
211, 111, 011
000, 160, 255
Strings with a numeric value over 255 do not match
255, 255, 255
255, 255, 256
4-Digit numbers will not match
1, 11, 111
11, 111, 1111
Strings that contain more, or less, than 3 numbers, do
not match. Strings with dangling commas do not match.
111, 122, 133
111, 122, 133, 144
111, 122, 133,
111, 122
111
Numbers 0-9 are valid as long as the numbers they are used
to form are between 0 and 255
209, 183, 245
"""#
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