import Foundation
let pattern = #"v?(?:(?:(?P<epoch>[0-9]+)!)?(?P<release>[0-9]+(?:\.[0-9]+)*)(?P<pre>[-_\.]?(?P<pre_l>(a|b|c|rc|alpha|beta|pre|preview))[-_\.]?(?P<pre_n>[0-9]+)?)?(?P<post>(?:-(?P<post_n1>[0-9]+))|(?:[-_\.]?(?P<post_l>post|rev|r)[-_\.]?(?P<post_n2>[0-9]+)?))?(?P<dev>[-_\.]?(?P<dev_l>dev)[-_\.]?(?P<dev_n>[0-9]+)?)?)(?:\+(?P<local>[a-z0-9]+(?:[-_\.][a-z0-9]+)*))?"#
let regex = try! NSRegularExpression(pattern: pattern, options: .anchorsMatchLines)
let testString = #"""
1.0.0.1
1.0.1
1.0
1
1.0rc1
1.0.0-rc
"""#
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