LeetCode 0193 - Valid Phone Numbers

Valid Phone Numbers

Desicription

Given a text file file.txt that contains 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:

代码语言：javascript复制

987-123-4567
123 456 7890
(123) 456-7890

Your script should output the following valid phone numbers:

代码语言：javascript复制

987-123-4567
(123) 456-7890

Solution

代码语言：javascript复制

# Read from the file file.txt and output all valid phone numbers to stdout.
grep -P '^(d{3}-|(d{3}) )d{3}-d{4}$' file.txt

file line numbers text txt

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