import Foundation
let pattern = #"""
(?P<q_num>\d{1,3})\)\s?(?P<quest>.+)\n
(\s?a\)\s?)(?P<ans_a>(?:(?![a-d]\)).)+)
(b\)\s?)(?P<ans_b>(?:(?![a-d]\)).)+)
((c\)\s?)(?P<ans_c>(?:(?![a-d]\)).)+))?
((d\)\s?)(?P<ans_d>(?:(?![a-d]\)).)+))?
"""#
let regex = try! NSRegularExpression(pattern: pattern, options: .allowCommentsAndWhitespace)
let testString = #"""
1) First question with 4 choices ?
a) First choice b) Second choice c) Third choice d) Last choice
2) Second question with only 3 choices ?
a) First choice b) Second choice c) Last choice
3) True or False ?
a) True b) False
"""#
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