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Problem: HP-UX compiler can't handle zero size array. (Charles Cooper)
Solution: Make the array one item big.
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Problem: New regexp engine: Matching plain text could be faster.
Solution: Detect a plain text match and handle it specifically. Add
vim_regfree().
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Problem: New regexp engine: negated flag is hardly used.
Solution: Add separate _NEG states, remove negated flag.
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Problem: New regexp engine is a bit slow.
Solution: Skip ahead to a character that must match. Don't try matching a
"^" patter past the start of line.
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Problem: New regexp engine: saving and restoring lastlist in the states
takes a lot of time.
Solution: Use a second lastlist value for the first recursive call.
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Problem: Can't build with regexp debugging. NFA debug output shows wrong
pattern.
Solution: Fix debugging code for recent changes. Add the pattern to the
program.
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Problem: New regexp engine does not support \z1 .. \z9 and \z(.
Solution: Implement the syntax submatches.
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Problem: New regexp engine: backreferences don't work correctly.
Solution: Add every possible start/end position on the state stack.
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Problem: New regexp engine does not support \%23c, \%<23c and the like.
Solution: Implement them. (partly by Yasuhiro Matsumoto)
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Problem: "\1" .. "\9" are not supported in the new regexp engine.
Solution: Implement them. Add a few more tests.
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Problem: New regexp performance: Copying a lot of position state.
Solution: Only copy the sub-expressions that are being used.
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Problem: New regexp: End of matching pattern not set correctly. (Cesar
Romani)
Solution: Quit the loop after finding the match. Store nfa_has_zend in the
program.
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Problem: Zero width match changes length of match.
Solution: For a zero width match put new states in the current position in
the state list.
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Problem: Unused field in nfa_state.
Solution: Remove lastthread.
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Problem: Syntax highlighting can be slow.
Solution: Include the NFA regexp engine. Add the 'regexpengine' option to
select which one is used. (various authors, including Ken Takata,
Andrei Aiordachioaie, Russ Cox, Xiaozhou Liua, Ian Young)
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