import Foundation
let pattern = #"(\d+)\s+((?:[A-Za-zA-Z0-9]{0,3})+)\s+((?:[A-Za-z0-9\)\(\]\:\/<>\[\"\.\,\+\'\-]{2,} ?)+)\s+(\d{2,7}-\d{2}-\d)"#
let regex = try! NSRegularExpression(pattern: pattern)
let testString = #"""
1 CH4 Methane 74-82-8
2 C2H2 Ethyne 74-86-2
5 C3H4 Propadiene 463-49-0
6 C3H4 Propyne 74-99-7
7 C3H6 Cyclopropane 75-19-4
10 C4H2 Butadiyne, Diacetylene 460-12-8
11 C4H4 1-Buten-3-yne, Vinylacetylene 689-97-4
12 C4H6 1,2-Butadiene 590-19-2
14 C4H6 Dibenzo[b,e]oxepine 107-00-6
16 C4H6 Cyclobutene 822-35-5
17 C4H8 1-Butene 106-98-9
18 C4H8 (E)-2-Butene 624-64-6
19 C4H8 (Z)-2-Butene 590-18-1
22 C4H8 Pyrazolo[4',3':6,7]oxepino[4,5-b]indole 115-11-7
23 C4H10 Butane 106-97-8
27 C5H8 Bicyclo[2.1.0]pentane 185-94-4
29 C5H8 3-Methyl-1-butyne 598-23-2
35 C5H8 (E)-1,3-Pentadiene 2004-70-8
41 C5H8 Spiro[2.2]pentane 157-40-4
45 C5H10 cis-1,2-Dimethylcyclopropane 930-18-7
66 C6H8 cis, anti, cis-Tricyclo[3.1.0.0(2,4)]hexane 21531-33-9
70 C6H10 2,3-Dimethyl-1,3-butadiene 513-81-5
71 C6H10 [1,1'-Binaphthalene]-3,3',4,4'-tetramine 513-81-5
"""#
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