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Make URLType regex compile faster

Python's `re` module seems to have a performance problem with
bracketed character classes containing huge ranges. This patch
deals with it by expressing valid characters through negation.

Disregarding surrogate pair and private use code points, all
IRI-incompatible characters can be found between 0x00 and 0x9F,
so they are easy to enumerate.

11 of 11 new or added lines in 1 file covered. (100.0%)

1789 of 1907 relevant lines covered (93.81%)

0.94 hits per line