Re: [cl-ppcre-devel] searching backward?

Edi Weitz edi@agharta.de writes:

No, there's no such thing as a :FROM-END keyword argument or the equivalent, and I'm also not aware of a regex facility in another programming language which has that.

Emacs does it somehow.

If you really need it, you could loop through the string applying SCAN until it matches with decreasing values for START, but that could be quite inefficient, of course. An alternative would be to work on (REVERSE TARGET) instead of TARGET, but you'll have to think hard how your regular expression should look like in that case - the semantics of things like "*" will certainly be different.

I was afaid you'd say that :). I guess I'll look closer into how emacs does it.

Thanks!

-Shawn