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Python code to match a string that contains only upper and lowercase letters, numbers & underscores. - YouTube
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How to write a function that takes in a string of one or more words, and returns the same string, but with five or more letter words reversed (only spaces and letters) -
Python: Match a string that contains only upper and lowercase letters, numbers, and underscores - w3resource
Python: Match a string that contains only upper and lowercase letters, numbers, and underscores - w3resource
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