[TxMt] Syntax highlight - regexp questions

Hi,

I'm having a go a writing a syntax highlighting format for markdown (http://daringfireball.net/projects/markdown/), and I've run into a couple of problems. The first is the lack negative look behind assertions which makes matching escaped sequences (eg. * * *) a lot more complicated. I can use begin, end and swallow, but there isn't any way to limit these to single line sequences. Are there any plans for including them in the future?

The second problem, which I haven't been able to overcome, is matching multiline sequences that end with (eg.) two newlines. For example: begin = "\*"; end = "\n{2,}" doesn't match what I'd expect. Is this a known problem?

Thanks,

Hadley