Well written code can be clear enough to not need comments or at least a minimal amount of commenting.
Human code review is a far better means of checking adherence to any standards. And good man management is the best way of getting your team to keep to the standards.
If you rely on a script to check for comments you could find that your programmers will find tricks to bypass it eg slotting in arbitrary comments in the code. Commented code is not necessarily readable code, its just code with comments in it.
If you do want to carry on with analyzing the source you might want to look at a grammar based parser