Three bugs in createChapterRegexps for English txt-to-epub conversion:
1. numberPattern had a capturing group (\d+|...) that leaked single
digits into split() results instead of chapter titles. Changed to
non-capturing (?:\d+|...).
2. combinedPattern wrapped the heading in (?:...) so split() consumed
the title without returning it. Changed to (...) capturing group,
matching the Chinese regex structure.
3. The prefix (?:^|\n|\s) allowed matching Chapter/Section after any
whitespace, causing mid-sentence false positives. Changed to
(?:^|\n) for line-start only.
Added a second-tier regex for bare numbered headings (e.g. "1.1The
Elements of Programming", "1Building Abstractions") commonly found
in academic texts. Dotted numbers allow optional space before title;
single bare digits require immediate title to avoid footnote matches.
Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Huang Xin
e41bcfbac9