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# Source : https://leetcode.com/problems/valid-phone-numbers/

# Author : Hao Chen

# Date : 2015-03-31

##################################################################################

#

# Given a text file file.txt that contains list of phone numbers (one per line), write a one liner bash script to print all valid phone numbers.

#

# You may assume that a valid phone number must appear in one of the following two formats: (xxx) xxx-xxxx or xxx-xxx-xxxx. (x means a digit)

#

# You may also assume each line in the text file must not contain leading or trailing white spaces.

#

# For example, assume that file.txt has the following content:

#

# 987-123-4567

# 123 456 7890

# (123) 456-7890

#

# Your script should output the following valid phone numbers:

#

# 987-123-4567

# (123) 456-7890

##################################################################################

#!/bin/sh

# Read from the file file.txt and output all valid phone numbers to stdout.

grep -P '^(\d{3}-|\(\d{3}\) )\d{3}-\d{4}$' file.txt