31 lines
1.0 KiB
Bash
31 lines
1.0 KiB
Bash
# Source : https://leetcode.com/problems/valid-phone-numbers/
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# Author : Hao Chen
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# Date : 2015-03-31
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##################################################################################
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#
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# 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.
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#
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# 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)
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#
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# You may also assume each line in the text file must not contain leading or trailing white spaces.
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#
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# For example, assume that file.txt has the following content:
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#
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# 987-123-4567
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# 123 456 7890
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# (123) 456-7890
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#
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# Your script should output the following valid phone numbers:
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#
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# 987-123-4567
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# (123) 456-7890
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##################################################################################
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#!/bin/sh
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# Read from the file file.txt and output all valid phone numbers to stdout.
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grep -P '^(\d{3}-|\(\d{3}\) )\d{3}-\d{4}$' file.txt
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