[development] grepping for relevant functions/lines

[Maggi Federico]

Hello List,
	I am new to Drupal and new to this list.

For research purposes, I am surveying code repositories of the top 10  
web applications using a modified version of StatSVN.

Basically, I need to track source changes, over releases, in terms of  
"Lines of Code (LOC) matching a certain regexp".

The functions/lines I am interested in are those somehow involved in  
handling HTTP request/session/response parameters. Of course, I allow  
a certain roughness in the analysis.

I am trying to build a list of such functions/lines. What would you  
suggest to include? What would you grep for if you want to estimate  
the functions that are, even indirectly, related to processing of HTTP  
requests/sessions/responses?

Any input is greatly appreciated. Thanks in advance. Cheers,

-- Federico