import Foundation
let pattern = #"(?:(?:(?:[2-9]|[1-2]\d|[3][0-5])\^\^(?:\w*\.\w+|\w+(?:\.(?!\.))\w*|\w+))|(?:\d*\.\d+|\d+(?:\.(?!\.))\d*|\d+))(?:(?:``(?:\+|-)?(?:\d*\.\d+|\d+\.\d*|\d+))|(?:`(?:(?:\+|-)?(?:\d*\.\d+|\d+\.\d*|\d+))?))?(?:\*\^(?:\+|-)?\d+)?"#
let regex = try! NSRegularExpression(pattern: pattern, options: .anchorsMatchLines)
let testString = #"""
// Correct Numbers
2^^101.101
35^^WolframLanguage
16^^dead.Beef
123`
1.381`
16^^9fe.c3`7
3.0`+7
3`7
3.000000000000000000000`7
3.000000000000000000`-7
3.98`5*^3
16^^dead.beef``+4*^-3
0.0000000001*^10
35^^small*^-10
10000000000*^-10
// Non-examples
1..
123...
35^^WolframLanguage
16^^dead..Beef
16^^9fe..c3`7
"""#
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