valid-phone-numbers

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Shell

Given a text file <code>file.txt</code> that contains a 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 <code>file.txt</code> has the following content:

<pre>
987-123-4567
123 456 7890
(123) 456-7890
</pre>

Your script should output the following valid phone numbers:

<pre>
987-123-4567
(123) 456-7890
</pre>

Valid Phone Numbers

给定一个包含电话号码列表（一行一个电话号码）的文本文件 <code>file.txt</code>，写一个单行 bash 脚本输出所有有效的电话号码。

你可以假设一个有效的电话号码必须满足以下两种格式： (xxx) xxx-xxxx 或 xxx-xxx-xxxx。（x 表示一个数字）

你也可以假设每行前后没有多余的空格字符。

 

示例：

假设 <code>file.txt</code> 内容如下：

<pre>
987-123-4567
123 456 7890
(123) 456-7890
</pre>

你的脚本应当输出下列有效的电话号码：

<pre>
987-123-4567
(123) 456-7890
</pre>