I want regex such that it accept any 9 digit number except 123456789 and 987654321

I want regex such that it accept any 9 digit number except 123456789 and 987654321

Problem Description:

Acceptable input : any 9 digit number

Not acceptable : 123456789 and 987654321

I am using [0-9]{9} but I want extra condition as well

Solution – 1

I would suggest that, as you only have two exceptions, you write the regex to confirm it’s a 9-digit numeric number, and then special case the two edge cases you mention. Not as technically challenging, but much easier to read the code.

Solution – 2

Try:

^(?!123456789|987654321)d{9}$

Regex demo.

^ – beginning of string

(?!123456789|987654321) – don’t continue matching if 123456789 or 987654321 is found

d{9} – match 9 digits

$ – end of string