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#!/usr/bin/env bash
## 193. Valid Phone Numbers
## 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.
##
## 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
##
## Read from the file file.txt and output all valid phone numbers to stdout.
## Using grep:
grep -P '^(\d{3}-|\(\d{3}\) )\d{3}-\d{4}$' file.txt
## Using sed:
sed -n -r '/^([0-9]{3}-|\([0-9]{3}\) )[0-9]{3}-[0-9]{4}$/p' file.txt
## Using awk:
awk '/^([0-9]{3}-|\([0-9]{3}\) )[0-9]{3}-[0-9]{4}$/' file.txt
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