Fix support for lookahead regex in conda
#506
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Hi team!
condasupports full PCRE regex on their MatchSpec object, but libsolv was only using POSIX regex. I've tried my best to implement this patch cleanly, but I am punching a bit above my weight.This works locally and fixes the issue described at mamba-org/mamba#1853 (plenty of details there if you need them), but maybe I did something wrong or used a shotgun to kill the fly kind of thing.
We need lookaheads to fix this long standing issue: conda/conda#11612