import Foundation
let pattern = #"(?<day>0?[1-9]|[12][0-9]|3[01])(?>.{1})(?(?=0?[469]|11)(?<!31(?>.{1}))|)(?(?=0?2)(?<!3[01](?>.{1})))(?(?=0?2(?>.{1})\d\d(?!00)(?:[02468][048]|[13579][26]))|(?<!29(?>.{1})))(?<month>0?[1-9]|1[12])(?>.{1})(?<year>19[0-9][0-9]|20[0-9][0-9]|[0-9]{2,4})(?!\d)"#
let regex = try! NSRegularExpression(pattern: pattern, options: .anchorsMatchLines)
let testString = #"""
29.02.1704
01.01.1987 // ok
101.01.19870 // bad- too many numbers
1.1.1987 // ok
32.02.1987 // bad- 32 feb
29.02.2001 // bad
0.0.1987 // bad
0.13.1987 // bad
8.8.8.8 // bad
31.04.1987 // bad
31.06.1987 // bad
31.09.1987 // bad
31.11.1987 // bad
30.02.1987 // bad
29.02/1987 // bad
29.02.1988 // ok
29.02.2000 // bad
29.02.2408
"""#
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