Add ability to search inside selection in editor [was: Search & Replace improvements]

[vordan]

Search & Replace is seriously underpowered. It has to work across files (at least, opened ones), inside selection, accept regular exceptions, escape sequences, whole words/parts only, etc.)..

[ussuri]

We have already implemented most parts of this:

• Search in the workspace: available now, although the UI is admittedly pretty arcane, and it's also slow, and always searches across all the loaded projects. Improving on this is a high priority.
• Search inside selection: not yet available; we depend on the Ace editor component for this.
• Regular expressions, whole words, and case-sensitive search: we used to disable this out of a cleaner UI considerations, but that was admittedly an ill-advised decision, so we've reenabled this functionality for the upcoming 0.17 release.

[ussuri]

I'll rename the issue to reflect the only remaining unimplemented request.