Check if a String is alphanumeric in Swift

string swift alphanumeric
ma11hew28 picture ma11hew28 · Mar 14, 2016 · Viewed 27.6k times · Source

In Swift, how can I check if a String is alphanumeric, ie, if it contains only one or more alphanumeric characters [a-zA-Z0-9], excluding letters with diacritics, eg, é.

Answer

ma11hew28 picture ma11hew28 · Mar 14, 2016 
extension String {
    var isAlphanumeric: Bool {
        return !isEmpty && range(of: "[^a-zA-Z0-9]", options: .regularExpression) == nil
    }
}

"".isAlphanumeric        // false
"abc".isAlphanumeric     // true
"123".isAlphanumeric     // true
"ABC123".isAlphanumeric  // true
"iOS 9".isAlphanumeric   // false

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