#193 Valid Phone Numbers

單純練習 regex

LeetCode

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.

input: list of phone numbers (one per line)
output: valid phone (xxx) xxx-xxxx or xxx-xxx-xxxx

Example:

Assume that file.txt has the following content:

987-123-4567
123 456 7890
[phone]
Your script should output the following valid phone numbers:

987-123-4567
[phone]

Edge Case

• 只有數字？

• 前面沒有空格

怎麼解

這題是 bash ，自己把它變成判斷是否 valid

var validPhone = function(num) {
    let re = /[\(]*\d{3}[\)]*[ -]\d{3}-\d{4}/
    return num.search(re);
};

console.log(validPhone("987-123-4567"))
console.log(validPhone("[phone]"))