Nagios checking help

We currently have nagios setup on a server, and it has been running quite well for some time now, but we are in need of setting up a http string test. Would anybody know how to do this. By string test I mean, rather than just connecting to port 80 to see if apache is up, connect, retrieve a page and check for a string...

Any help is greatly appreciated.

 

 

 

 

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