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that has entered your expression. The '.' specifies any character except line breaks, whereas the '+' specifies one or more of the preceding character.
So taking your expression and turning it into English we get "starting from the beginning (^), match EVERYTHING up until the word 'website' (.*website), then match ONE OR MORE of any character (.+), then match that the string contains '.com' (\.com), ending with 0 or more of EVERYTHING"
If your aim is to make the expression match "website.com" then you could use