LeetCode算法题整理（正则篇）regex

193. Valid Phone Numbers

使用bash命令在一行中提取一个文本中的手机号。原题

(xxx) xxx-xxxx or xxx-xxx-xxxx. (x means a digit).
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

awk '/^([0-9]{3}-|\([0-9]{3}\) )[0-9]{3}-[0-9]{4}$/' telephone.txt