Question

How to check if a string contains only English letters in Swift

Answer 1

import Foundation

func isOnlyEnglishLetters(_ s: String) -> Bool {
    let pattern = "^[a-zA-Z]+$"
    
    let regex = try! NSRegularExpression(pattern: pattern)
    let range = NSRange(location: 0, length: s.utf16.count)
    
    return regex.firstMatch(in: s, options: [], range: range) != nil
}

let s1 = "Swift"
print(isOnlyEnglishLetters(s1))

let s2 = "Swift迅速"
print(isOnlyEnglishLetters(s2))



/*
run:

true
false

*/

 

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