Just had a thought that would really could use some interesting options added:
1) Search in chunks, snippets, plugins and modules too ... sometimes things need to be altered there as well.
2) Search by creation/modification date.
3) Add checkboxes for the ones you want to selectively modify.
3) Use the checkboxes to selectively apply replacement actions or alternately export found the set (or subset) as a MySQL DB dump.
Combined with Subversion, this would give you a down-and-dirty way to migrate changes from a dev-environment to a production environment for web apps. For example you could search for all changes in your snippets and chunks (and content) since your last push to live which occurred on Jun 3, 2008 at 4PM. Any documents, snippets, chunks, etc. with a creation date or modified date after that time could be found and flagged for migration.
I’d be willing to pay for this addition.
Regardless, it should also search in chunks at a bare minimum since those often contain site-wide things (headers, footers, sidebar content blocks, etc.).
Great work and works awesome!