import Foundation
let pattern = ##"^(?:(?:[-\w\d?*.+|{}\\\/\s<>\]])|(?:\\[\[\]()])|^[\[(].+?[\])])+\s*(#+.*)$"##
let regex = try! NSRegularExpression(pattern: pattern, options: .anchorsMatchLines)
let testString = ####"""
(\h{8}-\h{4}-\h{4}-\h{4}-\h{12}) # match UUID (no square brackets at all)
([A-Za-z_][A-Za-z0-9_]*) # valid Python identifier (paired unescaped square brackets)
(\||\[|\?) # match some stuff (escaped opening square bracket)
[A-Za-z # letters
0-9_-.] ### stuff
(\[ # works if escaped [ is in group
\[ # and on its own...
if | pass | raise | return | try | while | with # this should be a comment
\h # a hex digit
"""####
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