If the server is *nix and you have SSH access you can use grep to find all occurences of a string in all files in a folder, a specific file or recursively for everything in a folder at any level below.
Another option (i.e. if you don't have ssh or other access to the web server's command line interface), would be to write a little PHP script. At the simplest:
"Please give us a simple answer, so that we don't have to think, because if we think, we might find answers that don't fit the way we want the world to be."
~ Terry Pratchett in Nation
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