title: regex 13 digits phone number with dash
body: <p>I have an application that needs to handle validation for phone numbers. Phone numbers are required to have 13 characters (sum of numbers and dashes). There must be at least 1 dash and a maximum of 3 dashes. The starting character must be a digit. How can I create a regex for this validation? Here is my regex string. <code>/^(?:[0-9]-*){13}$/</code> It doesn't work exactly what I expected</p>