I think Marc-André would know, because my recollection is that Marc-André Lemburg was also involved in this, but maybe not in the regular expression engine, but in the Unicode implementation.
Although DOS memory management is in principle very simple, users may find some of its behaviors surprising. The addition of UMB support in DOS 5.0 made DOS memory management noticeably less simple than before, although only TSRs and drivers tend to worry about upper memory.
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The TLB is flushed entirely on any write to CR3 (the page directory base register). There is no per-entry invalidation on the 386 -- that arrived with the 486's INVLPG instruction.