leetcode-193-Valid-Phone-Numbers

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描述

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:

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987-123-4567
123 456 7890
(123) 456-7890

解决方案

一个正则表达式解决

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# Read from the file file.txt and output all valid phone numbers to stdout.
awk '/^(\([0-9]{3}\) |[0-9]{3}-)[0-9]{3}-[0-9]{4}$/' file.txt

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