26 lines
624 B
Markdown
26 lines
624 B
Markdown
# 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
|
|
```
|