. Given an alphabet with opening and closing parentheses {), (} only, create a regex that validates all strings containing the sub-string (((). Make sure to support your answer with the proper reasoning. 2. Build a regular expression that captures the 10-digit US phone numbers (10 digits excluding the coun- try code, country code is optional), where # means any number from 0 to 9. Make sure to support your answer with the proper reasoning. It is recommended to use # instead of [0-9] for simplicity and you can follow the rules mentioned below as your test cases (this list is not exhaustive). • ########## • ###-###-#### • (###) ###-#### • ###.###-#### • ### ### #### • ###.###.#### • +1 ### ### ####

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