my-solutions/leetcode/0193-valid-phone-numbers/readme.md

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# 193. Valid Phone Numbers
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
```