import Foundation
let pattern = #"(?<matrix>(?:\[[^\]]+\])|(?:<[^>]+>)|(?:\{[^\}]+\}))|(?<function>\w+(?=\())|(\d+[eE][-+]\d+)|(?<operand>\w+)|(?<operator>[-+\/*%])|(?<symbol>.)"#
let regex = try! NSRegularExpression(pattern: pattern)
let testString = #"""
2!+atan2(3+9,2+3)-2*PI+3/3-9-12%3*sin(9-9)+(2+6/2)
2+3-9*[{2+3,2,6},{7,2+3,2+3i}]+9*6
{[2,5][9/8,func(2+3)]}+9*8/5
<[2,9,2.36][2,3,2!]>*<[2,3,9][23+9*8/8,2,3]>
"""#
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