https://stackoverflow.com/a/61916948/1271826

String+Regex.swift

extension String {
    func matches(of regex: String, options: NSRegularExpression.Options = []) throws -> [String] {
        try NSRegularExpression(pattern: regex, options: options)
            .matches(in: self, range: NSRange(startIndex..., in: self))
            .compactMap { Range($0.range, in: self) }
            .map { String(self[$0]) }
    }
}

Then you can do things like:

let string = "There are 42 apples and 13 oranges."
let results = try string.matches(of: #"\d+"#)
print(results) // ["42", "13"]

or, the following will do a case insensitive search

let result = try string.matches(of: "Rob(ert)? Ryan", options: .caseInsensitive)