#534 Multiple regular expressions in bibtex key generator

[skinny]

It would be very nice to have multiple boxes for regular expressions in Options-Preference-Bibtex key generator.

F.x. I'd like to first replace all .etal with _etal using:

\.etal replace with _etal

and then subsequently replace all . with _and_ with:

\. replace with _and_

Again thanks for the effort on JabRef!

Martin