valid-phone-number.sh

#!/bin/bash
# Incase you have to take input, please take it from file named 'input' (without quotes) [e.g. cat input]
# Print your final output to console. Do not redirect to another file.
# E.g. Suppose the question is to print the content of a file.
#      Your solution should be 'cat input'(without quotes) instead of 'cat input > output'. That's it!
# Your code starts from here...


# Valid phone numbber format
#  (xxx) xxx-xxxx
#  xxx-xxx-xxxx
# https://www.interviewbit.com/problems/valid-phone-number/

grep -E '(^\([0-9]{3}\) [0-9]{3}-[0-9]{4}$)|(^[0-9]{3}\-[0-9]{3}\-[0-9]{4}$)' input