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Extract with Regex Input Validation

I have been using some basic regex to validate inputs

I am now trying to find a way to validate that a user has entered “www.” and can’t figure a way. The only things I’ve been able to do is get validation that “www” had been entered but not the “.”

Does anybody have a regex pattern to do such a thing, or a place online that provides regex patterns for input validation?

I’ve been trying to follow this

Which helped me to validate for other inputs and criteria, but failing to get things right on the “www.” pattern.