How to extract data within parenthesis in swift?

Question

I'm trying to extract some numbers within a parenthesis in swift.

Eg.

var accname = "(1234) some random texts"

How to get 1234 from var s ? The numbers in the bracket does not have a fixed length. It can be (12) or (12345).

This is what I have tried

var accname = ""
for i in accname.characters.indices[(accname.startIndex)..<accname.endIndex]{

       while accname[i] != ")"{
                accnumb.append(accname[i])
        }
        }

Answer 1

Well you can use below extension suggested by @oisdk for that:

var demoText = "(1234)  e e e er er e"

extension String {
func slice(from: String, to: String) -> String? {
    
    return (range(of: from)?.upperBound).flatMap { substringFrom in
        (range(of: to, range: substringFrom..<endIndex)?.lowerBound).map { substringTo in
            String(self[substringFrom..<substringTo])
        }
    }
}
}


let sliced  = demoText.slice(from: "(", to: ")")