Swift Tutorials

How to Check if String contains only Alphabets and Numbers in Swift

How to Check if String contains only Alphabets and Numbers in Swift ?

Answer

To check if a string contains only alphabets and numbers in Swift, you can use regular expressions from the NSRegularExpression class.

✐ Examples

1 Check if String contains only Alphabets and Numbers using regular expression

In this example,

We import the Foundation framework to use regular expressions.
We create a regular expression pattern that matches alphabets and numbers only.
We use the NSRegularExpression class to create a regular expression object with the pattern.
We use the matches method of the regular expression to check if the string matches the pattern.
If the string contains only alphabets and numbers, containsOnlyAlphabetsAndNumbers will be true, otherwise false.
Finally, we print the result.

Swift Program

import Foundation

let str = "Hello123"
let pattern = "^[a-zA-Z0-9]+$"
let regex = try! NSRegularExpression(pattern: pattern)
let matches = regex.matches(in: str, range: NSRange(str.startIndex..., in: str))
let containsOnlyAlphabetsAndNumbers = !matches.isEmpty
print("String contains only alphabets and numbers:", containsOnlyAlphabetsAndNumbers)

Output

String contains only alphabets and numbers: true

Summary

In this tutorial, we learned How to Check if String contains only Alphabets and Numbers in Swift language with well detailed examples.

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