Question

How to check if a string contains only letters and numbers using RegEx in Swift

Answer 1

import Foundation

func isAlphanumeric(_ str: String) -> Bool {
    let alphanumericRegex = "^[a-zA-Z0-9]+$"

    if let regex = try? NSRegularExpression(pattern: alphanumericRegex) {
        let range = NSRange(location: 0, length: str.utf16.count)
        return regex.firstMatch(in: str, options: [], range: range) != nil
    } else {
        return false // Handle invalid regex case
    }
}

let str = "VuZ3q7J4wo35Pi"

if isAlphanumeric(str) {
    print("The string contains only letters and numbers.")
} else {
    print("The string contains characters other than letters and numbers.")
}

 
 
/*
run:

The string contains only letters and numbers.
 
*/

 

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