Is there a page that shows a mapping between different implementations of regular expressions and which languages and applications they're used in? Is there a better way to figure these things out than hunt for documentation every time?
But I think it wouldn't be hard to do a plugin that translates a pcre into a Vim regex, allowing you to search or replace using pcres.
My code though is not integrated with Vim, it takes a free floating regex and converts it. I used it to convert all the regexes in Vim syntax files and build a syntax highlighter. It was a silly project, just for fun.
Of course, Vim is one of the few regex engines to support variable width negative look-behinds, so I guess that counts for something. :)
It's not in Vim.org. I had the code floating around with an MIT license, but it's offline right now. I thought about building a page where you could do the translation (I figured Perl -> Vim is what people would want more) or just use a simple GET request from other code.
Maybe I should do the Perl -> Vim bit and make it available.