193. Valid Phone Numbers#1
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题目摘要
从文件里筛选出电话号码，电话号码有两种格式 (xxx) xxx-xxxx 和 xxx-xxx-xxxx。假设每行头尾都没有空格。
解法
注意
可问问题
原题
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
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