How to make a RegEx to replace any domains with a string?

Question

PHP

Greetings. There is a task - to replace all domains in a string with another string, and also if a domain is found - to return true. How to do it? Regulars from the database will not help here, and I myself am a complete zero in them and all my attempts to understand anything were unsuccessful)

Answer 1

( http://)?([^\n ]+\.)?([^.\n ]+\.)([^.\n ]+)
still indicate the kind of data that you consider a domain, for example http:// etc.