This is the feature I miss the most (when writing Rails code).
How it works : 1°/ select a directory, and 2°/ mark it as "exclude from 'find in project'"
context: in Rails, the log files and 3rd party code (EdgeRails, plugins, javascript libs, docs ..) are all in your project tree => your code can be less than 10% of the total files/code present in the project ===> most of the results entries are useless, because out of scope.
Alain