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Java-based LeetCode algorithm problem solutions, regularly updated

There is a newer version: 1.35

193\. Valid Phone Numbers

Easy

Given a text file `file.txt` 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 `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