filter http traffic

[Sdflkaj Jksdfj <kenterer1 () ymail com>]

Hey there,

i want to filter search requests to e.g. google which have certain keywords.

my suggestion is the following:

 alert tcp any any -> any any (pcre: "/(keyword1|keyword2)*/"; msg: "someone searches for rootkit or malware in google 
bing or yahooo"; sid: 1000004;rev:1;) 


 Since i want to be able to use regular expressions i use PCRE. However this line only gives alarm if i use the "url 
bar" of the browser to search for   keywords. if i visit google.com and type the keywords in the input box, there is no 
alarm  going of . : / 


i would appreciate any inspiration.

cheers
kenterer

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