To classify the feeds subscribed at Google reader, based on certain rules, Google Reader Filter can be used. Its a simple GreaseMonkey script for Firefox, which means we don’t need to install any addons to activate it. Once this script is installed we can specify the conditions based on which the highlight/exclusion is applied.
Refresh Google Reader and click on filter settings button on the right top and enter your rules in plain text. For specifying advanced rules, few of the RegEx chars can be used.

* Here Trial|Shareware|Demo|Adware in the Excludes section implies that any one of the keyword match from the four specified will exclude (greys out) that post










