import Foundation
let pattern = #"""
(?<tag>(?&TAG)):\s*
(?<message>.*?)
(
<
(?<author>(?:\w{3}\s*,\s*)*\w{3})?\s*
(?<date>(?&DATE))?
(?<flags>(?&FLAGS))?
>
)?
$
(?(DEFINE)
(?<TAG>\b(NOTE|LEGACY|HACK|TODO|FIXME|XXX|BUG))
(?<DATE>\d{4}-\d{2}-\d{2})
(?<FLAGS>[pts]:\w+\b)
)
"""#
let regex = try! NSRegularExpression(pattern: pattern, options: [.anchorsMatchLines, .allowCommentsAndWhitespace])
let testString = #"""
// NOTE: A small example
// HACK: Another example <ABC 2014-02-03>
// HACK: Another example <ABC,DEF 2014-02-03>
// HACK: Another example <ABC,DEF p:0>
"""#
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