title: JavaScript Regex not matching mobile number with international code
body: <p>Am trying to validate a mobile number <code>254777123456</code> against a regex <code>/^((254|255)[0-9]+){9,15}$/</code>, the mobile number should be prefixed with the country codes specified but the total length of the mobile number should not be more than 15 characters, doing this via javascript am getting null, can anyone point out what am doing wrong.</p>
  
  <p>PS. Am using way more country codes than the ones I specified, I just put those two as a test before I add the others because they will all be separated by the pipe.</p>