import Foundation
let pattern = #"^(?!\-)(?:(?:[a-zA-Z\d][a-zA-Z\d\-]{0,61})?[a-zA-Z\d]\.){1,126}(?!\d+)[a-zA-Z\d]{1,63}$"#
let regex = try! NSRegularExpression(pattern: pattern, options: .anchorsMatchLines)
let testString = #"""
invalid-.domains
-domain.com
domain--.com
-domain-.-.com
domain.000
.domain.net
domain.net.
sub.-domain.com
sub.domain-.com
sub-.domain.com
-sub.domain.com
valid.domains.below
schools.k12
newTLD.clothing
good.photography
x.a-b.com
x-y.a-b.net
x-y.a-b-c.co.uk
x.0ac.com
schools.k12
newTLD.clothing
good.photography
0-1-2.3-4.co
a-----b.com
"""#
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