import Foundation
let pattern = #"\([a-zA-Z]+\)\n(.+)"#
let regex = try! NSRegularExpression(pattern: pattern, options: .anchorsMatchLines)
let testString = #"""
17.
If you go on increasing the stretching force on a wire in a
guitar, its frequency.
(a)
increases
(b)
decreases
(c)
remains unchanged
(d)
None of these
some random text between questions
18.
A vibrating body
(a)
will always produce sound
(b)
may or may not produce sound if the amplitude of
vibration is low
(c)
will produce sound which depends upon frequency
(d)
None of these
19.
The wavelength of infrasonics in air is of the order of
(a)
100 m
(b)
101 m
(c)
10–1 m
(d)
10–2 m
"""#
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