grep "^\(([[:digit:]][[:digit:]][[:digit:]]) [[:digit:]][[:digit:]][[:digit:]]-[[:digit:]][[:digit:]][[:digit:]][[:digit:]]\|[[:digit:]][[:digit:]][[:digit:]]-[[:digit:]][[:digit:]][[:digit:]]-[[:digit:]][[:digit:]][[:digit:]][[:digit:]]\)$" file.txt

Add bash solution for 193. Valid Phone Numbers
Add bash solution for 193. Valid Phone Numbers

193. Valid Phone Numbers: https://leetcode.com/problems/valid-phone-numbers/
