process check problem

Greetings,

I have modified the ps in all my clients so that it also sends out per-process cpu usage, and now am trying to use a regular perl expression in the search for processes with a certain usage percentage.
Here is what i have: %(8\d{2}\.\d{2})|(9[0-4]\.\d{2}) and %(9[5-9]\.\d{2})|(1\d{2}\.\d{2}) as 2 of my searches

These don't work however, because they pull up everything that is 8.xx 8x.xx 9.xx 9x.xx 1.xx 1x.xx and 1xx.xx I know these espressions work, because i tested them in a perl application... all i am trying to make it pull out is 8x.xx 9x.xx and 1xx.xx

Any ideas for a fix (either a patch or another way to do this type of a search)??

thanks, Adam