193. Valid Phone Numbers leetcode Bash

本文提供了一个bash脚本,用于读取包含电话号码的文本文件,并使用正则表达式筛选出有效的电话号码格式:(xxx)xxx-xxxx 或 xxx-xxx-xxxx。

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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.

For 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

# 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


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