Go 3rd party.
Take a look at Base Elements, Inspector and Developer Assistant.
Two methods I use, one free and one paid:
BaseElements, which is a great tool for other purposes.
Print to PDF and then search the PDF.
+ on both methods! I print amap (as much as possible) when debugging. PDF is a very searchable way without corning the market on ink and giving my kids an overload of Scratch paper.
I keep some versions back as I make major changes. I have to re-enter from the PDF copy, but if I find I really needed that variable set-just-so my bacon is saved.
I also run DDRs, but the PDFs have their different advantages.
-- sent from my iPhone4 --
You could print out the script to PDF, then search that.
If you have the Advanced version, you can produce a DDR of all scripts at once. You can search the DDR directly, without using a third-paty DDR tool.
David mentioned the Deverloper Assistent product. I would HIGHLY recommend this plug-in (from Dracoventions) for your development machine. You can search one script or all your scripts in a single step. The plug-in is pretty inexpensive, will save you a massive amount of time, and will help ensure you don't overlook something. In my case, the plug-in paid for itself the first day I used it.
Anytime I'm working in a database, I just use a special keystorke sequence to pop up the dialog box that lets me start a search for any string in one or more scripts ... or in the field definitions of a table ... etc.
Here's a link to more details:
They've got a free trial ... Get it!