One feature I've had the need for recently is the ability to extract text matching a Regular Expression, with the actual text that is extracted matching a Replacement Expression (ie. so you can use back references from the Find RE).

For example, some text I wish to match is as follows:



where the numbers can change. When extracted, I want the numbered parts to be swapped, so in this example, the text extracted to the new document would be:



So, I use the following Find Regular Expression:



and want to use the following Replacement Expression to extract the text to a new line:



It would be great if there was an easy way to do this from both the Replace dialog, Replace in Files dialog, and Find bar. For the Replace in Files, it would be handy if there was an option to either put all matches in a single new file, or have separate new documents for each file.

Also, maybe the Find plugin could be extended to become a Find/Replace/Extract plugin.

With this feature, text could be extracted/mined from files.