valid-phone-numbers

Valid Phone Numbers

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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>

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