Javascript phone number validation

Question

I want to make sure phone numbers are entered correctly. They are UK numbers and cannot contain any symbols or letters. They must be 11 in length.

So I have tried the following:

else if (phone == null || !phone.toString().match(/^[-]?\d*\.?\d*$/)){

But this actually allows any length and even blank input.

What should I do to validate phone numbers? I'm not that experienced with Javascript.

Answer 1

The regexp to match exactly 11 digits is /^\d{11}$/.