Support for regex / scoping redirect rules

[shreevatsa]

[I hope it's ok to use this issues section for feedback and feature requests.]

Does it seem possible to add either regex support, or a "run only on these domains" feature?

Background:

My main use case for a redirect extension is with Google Docs / Spreadsheets / Presentations: I'd like to replace /edit and /view links with /preview.

For this, I added Switcheroo rules /edit -> /preview and /view -> /preview. As you might expect, this leads to trouble on other websites, whose URL also contains /view or /edit (or of course, when I actually want to edit a Google Doc / Spreadsheet). For now I've worked around by adding further rules /reallyedit -> /edit and /reallyview -> /view, but the ideal solution would be either

1. Being able to say: apply this particular rule (/edit -> /preview) only on domain docs.google.com.
2. [More general] Being able to give the replacement rule as a regular expression with backreferences, e.g. replace docs.google.com/(.*)/edit with docs.google.com/\1/preview

[HoneyryderChuck]

+1 , I'd need this to remove the port from URLs coming from our Intranet.

[gjj]

+1 #11 could also be used to match timestamps in js when currently, the target js wouldn't be matched at all

[kanihal]

+1 for regex support