I had made rule for blocking all kinds of extensions in my Squidguard, below line is used in regular expression

(./..(asf|wm|wma|wmv|midi|vob|mkv|3gp|mp3|mp4|avi|mpg|exe|mpeg|mp.|mpv|flv|wm.|torrent|scr|pif|vpu))

Now everything is working fine, but now I want to allow some special kind of EXE file which can be able to download for e.g  - mpam-d.exe, nis_full.exe, mpam-fe, upgradeall.exe. And for that I had made a new rule and used in regular expression to all this file below is the rule.

(./..(flv|mpam-d.exe|nis_full.exe|mpam-fe|upgradeall.exe))

My blocking extension rule is below of the new rule been created for allowing the EXE files.
I had whitelisted the rule of allowing exe.
But still squid goes to the blockexe rule and blocks the downloads of the allowed exe files.

Request you to please suggest for the same