Regular Expression to validate Rate of Interest Format Swift3

Question

I have been trying to work on Regular Expressions for one of my TextField to only allow digits in Rate of Interest format.

I want the field to allow input of max 2 digits before "." character and max 2 digits after.

Valid Formats:

1, 10, 1.2, 11.4, 15.24

And Max length of the field to be 5 characters

I tried a few but nothing worked out.

Answer 1

Try the below code

let string = "10.55"

if let match = string.range(of: "^\\d{1,2}(\\.\\d{1,2})?$", options: .regularExpression) {
    print("Match")
}

Or you can use guard too

guard let match = string.range(of: "^\\d{1,2}(\\.\\d{1,2})?$", options: .regularExpression) else {
    return
}