[Patch] Support assertions and greedy/ungreedy matching in regex

[Tim Shen]

This patch implement the (expecting) last two features in regex. Work
is easier after this ;)

I do think the _ResultsEntry is a little bit ugly, but I've tried my best.

Tested under x86_64 with -m64 -m32 and debug mode, but changed one
line after that. I'll test again before committing.

Thanks!


-- 
Tim Shen
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