Question about regex

[Xessa]

I have phone area textbox and i want to test it against values like 1111111 or 9999999.

I want at least 1 character to be different in this text area(it is exactly 7 characters long)

How can i do this in its shortest way?

[ShawnCplus]

You should still make your checks for length before this but this will check for numbers like 1111111 and 999999

var phone_number = "9999999";
if (!/^(\d)\1{6}$/.test(phone_number)) {
  alert('Good phone number');
} else {
  alert('Bad phone number');
}