How to check whether a String object is a link or not?

Question

How a string object can be validate whether it is a link or not? I don't want to open any connection or network operation I just to want to check the pattern of string is matching to the pattern of a link or not. e.g

    let str1 = "https://stackoverflow.com/questions/ask" // It is a link
    let str2 = "https://stackoverflow.com" // It is a link
     // Could be other combinations as well of a valid link 
    let str3 = "this is not a link" // Not a link

How to do that? Is It possible to check with regular expression or any other way or not possible?

yes but how to apply this in swift ? Can you explain it ?thanks — Afsar edrisy, Jan 23 '20 at 14:36
also this may help https://stackoverflow.com/questions/28079123/how-to-check-validity-of-url-in-swift — Teja Nandamuri, Jan 23 '20 at 14:41

score 3 · Accepted Answer · answered Jan 23 '20 at 14:35

3

You can do the check with URL initializer that returns optional value. Example

let str1 = "https://stackoverflow.com/questions/ask"
if let url = URL.init(string: str1) {
        // It will pass            
}

let str2 = "not a link"
if let url = URL.init(string: str2) {
        // It will not pass            
}

You can do exactly the same with guard let - else { }

answered Jan 23 '20 at 14:35

Vasilis D.

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This is not passing for "not a link" but passing for "notalink" which is not a link. – MADHAVI KUMARI Jan 24 '20 at 05:34
Dosei penalty to OFI – Vasilis D. Jan 24 '20 at 09:05

How to check whether a String object is a link or not?

1 Answers1