Check or validation Persian(Farsi) string swift

Question

I searched over web pages and stack overflow about validation of a Persian(Farsi) language string. Most of them have mentioned Arabic letters. Also, I want to know if my string is fully Persian(not contain). for example, these strings are Persian:

"چهار راه"

"خیابان."

And These are not:

"خیابان 5"

"چرا copy کردی؟"

Also, just Persian or Arabic digits are allowed. There are exceptions about [.,-!] characters(because keyboards are not supported these characters in Persian)

UPDATE: I explained a swift version of using regex and predicate in my answer.

Answer 1

After a period I could find a better way:

extension String {
 var isPersian: Bool {
        let predicate = NSPredicate(format: "SELF MATCHES %@",
                                    "([-.]*\\s*[-.]*\\p{Arabic}*[-.]*\\s*)*[-.]*")
        return predicate.evaluate(with: self)
    }

}

and you can use like this:

print("yourString".isPersian) //response: true or false

The main key is using regex and predicate. these links help you to manipulate whatever you want:

https://nshipster.com/nspredicate/

https://nspredicate.xyz/

http://userguide.icu-project.org/strings/regexp

Feel free and ask whatever question about this topic :D

[EDIT] The following regex can be used to accept Latin numerics, as they are mostly accepted in Persian texts

"([-.]*\\s*[-.]*\\p{Arabic}*[0-9]*[-.]*\\s*)*[-.]*"