import Foundation
let pattern = #"(?<=^.. |^... |^.... )([^,]*,[^,:]*)"#
let regex = try! NSRegularExpression(pattern: pattern, options: .anchorsMatchLines)
let testString = #"""
46. Delmay, B.: I personaggi della Divina Commedia. Volume 201. Olschki (1986)
129. Kurucz, R.: Atlas9 stellar atmosphere programs and 2 km/s grid. ATLAS9 Stellar Atmosphere Programs and 2 km/s grid. Kurucz CD-ROM No. 13. Cambridge, Mass.: Smithsonian Astrophysical Observatory, 1993. 13 (1993)
130. Andrewes, D.G., Holton, J.R., Leovy, C.B.: Middle atmosphere dynamics. Number 40. Academic press (1987)
6. Welch, T.A.: A technique for high-performance data compression. Computer 17(6) (1984) 8–19
47. Alighieri, D., Landino, C., da Figino, P., Capcasa, M.: La divina commedia. G. Silvestri (1829)
"""#
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