Project Definition Length Validation

Hi Experts,

I am using free project numbering within a range (not using coding mask)

I have a validation restricting my project code between a range 0070000000 - 0079999999

however its allowing me to create project with code eg, 007001 . Its not allowing 008 or any other series though, which is good.

I want to make sure the project code is always 10 character long. How do I have it with validation?

Thanks,

Krishna