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Churk has hit the nail on the head. Your requirements for a “valid URL” are too lose to provide an answer. It sounds like you just want to make sure the input looks like it could possibly be a URL or host name. If that’s the case, the only thing you can really do is make sure it doesn’t contain any spaces

Wir bringen
Licht
in Form

Churk has hit the nail on the head. Your requirements for a “valid URL” are too lose to provide an answer. It sounds like you just want to make sure the input looks like it could possibly be a URL or host name. If that’s the case, the only thing you can really do is make sure it doesn’t contain any spaces