Regex for 8 digits non repeating numbers

I want to make a regex for 8 digit non-repeating regex for phone number. It should not match with 11111111 or 22222222 …. 88888888

I tried to make a Regex but it only matches for 1

Example – ^(?!.*([0-9])1{7})[0-9]{8}$

What corrections do I need in this?

>Solution :

Do this:

^(\d)(?!\1{7})\d{7}$

Capture the first digit and then ensure that it is not repeated 7 more times.

Demo