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This is the most straightforward approach: first regexp limits dictionary file to words with thirteen or more characters, second regexp discards any words that have a letter repeated. (Bonus challenge: Try doing it in a single regexp!)
Its possible to user a simple regex to extract de username from the finger command.
The final echo its optional, just for remove the initial space
url can be like any one of followings:
If url mismatching, whole url will be returned.