The Chinese chapter-detection regex treated certain measure words (the
classifiers for "letter" and "book") as chapter units and let a title
attach directly after the unit. As a result, ordinary prose such as
"the first letter" or "the fourth book records..." was split out as
bogus TOC entries when importing Chinese TXT novels.
Split the unit characters into two explicit tiers that share the same
number prefix and stay in one alternation (a single split pass, so a
segment mixing chapter and volume headings is handled together):
- Chapter units may carry a title attached directly, unchanged.
- Volume/measure-word units only start a heading when the title is
introduced by a separator (colon, comma, space, or parentheses) or
the line ends, never a bare noun directly after the unit.
Real volume and chapter headings still match. Adds regex-level and
end-to-end tests covering both reported cases.
Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Huang Xin
1faa931a0e