Fastest method for testing a fixed phone number pattern

Question

So, the challenge is that we are trying to detect if a string matches a fixed phone number pattern, this is a simple string pattern.

The pattern is:

Answer 1

you can use regex for that:

if(/^[0-9]{3}-[0-9]{3}-[0-9]{4}$/.test('123-456-7890'))
    //ok
else
    //not ok