How do you confirm a string only contains numbers in Swift? [duplicate]

Question

How can I check, if searchView contains just numbers?

I found this:

if newText.isMatchedByRegex("^(?:|0|[1-9]\\d*)(?:\\.\\d*)?$") { ... }

but it checks if text contains any number. How can I do, that if all text contains just numbers in Swift?

Answer 1

Here is the solution you can get all digits from String.

Swift 3.0 :

 let testString = "asdfsdsds12345gdssdsasdf"

 let phone = testString.components(separatedBy: CharacterSet.decimalDigits.inverted).joined(separator: "")

 print(phone)

Answer 2

you can use "^[0-9]+$" instade "^(?:|0|[1-9]\\d*)(?:\\.\\d*)?$"

This will accept one or more digits, if you want to accept only one digit then remove +