Your current regex doesn’t work because it tries to look for
^[A-Z]+[a-z]+[\s]+[a-z]+[\.!\?]$: https://regex101.com/r/b96zXT/2
^[A-Z]+: One or more capital letters at the start of the string[a-z]+: One or more small letters after the capital letters[\s]+: One or more whitespaces after the small letters[a-z]+: One or more small letters after the spaces[\.!\?]+$: One or more of the punctuations (.,!, or?) after the second run of small letters, and then the string ends.
What you actually want to do:
^[A-Z][A-Za-z\s]+[\.!\?]$ https://regex101.com/r/r3CAdh/2
^[A-Z]: Exactly one capital letter at the start of the string[A-Za-z\s]+: One or more capital letters / small letters / spaces[\.!\?]$: One punctuation mark at the end of the string
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solved What is the correct regex for this exercise in python? [closed]