Description
I find myself often using Find and Replace in files to replace something in multiple files, often using regular expressions. Since there's no undo for this operation, I always feel a little bit nervous when a RegExp is somewhat complicated, so I have to try it first on one file using the regular Find&Replace dialog, then copy&paste my RegExp and replacement string to the F&R in Files dialog, and run it on all files.
If there are no plans to add undo feature to F&R in Files, and actually even if there was an undo, it would be so useful to have ability to preview what's gonna happen: matches found, and for each match, the corresponding replacement text. So a user would do the dry run / preview first, and if everything looks kosher, do the actual replacement.
Here are screenshots of a plug-in for FAR file manager which implements a similar feature.
