limiting TMSH iRules listing

Hi! I need to get a usable list of irules with their content for automation purposes. But what is getting into my way are built-in irules (those "_sys_" named with verified status).

Is there some way to list all the irules without the built-in ones? I've found out in tmsh documentation that you can use regexp in tmsh list ltm rule command, but how can I negate the search pattern. I tried some negative lookbehind but it doesn't seem to work:

(tmos) list ltm rule @(\?

Any ideas?