prefix_process called re.sub(f".{group}.", "", raw) unconditionally. When
group was empty (torrents that don't start with [group]), the pattern
degenerated to ".." and every pair of characters in the title was deleted,
leaving a stub the downstream splitter couldn't turn into title_en/zh/jp.
Guarded the substitution with `if group:`. Titles like
"冰之城墙「氷の城壁」The Ramparts of Ice S01E02 1080p 日英双语-多国字幕"
and "Girls Band Cry S01E05 ..." now parse correctly. Updated #764's test
which had been pinned to the broken behavior.
Closes#1025
Add _fallback_parse() tried when TITLE_RE.match() returns None, using two
regex patterns to extract episode numbers from formats the main regex misses:
- digits before [ bracket (issues #876, #910)
- compound [02(57)] format (issue #773)
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Add 13 new test cases across three parser test files:
- raw_parser: Chinese 第二季, 2160p resolution, bracketed Season N, multi-group with Chinese punctuation, English-only title
- torrent_parser: EP format, tc/zh-tw subtitle, no-language subtitle (ValidationError), multi-level path, [NNvN] version suffix
- path_parser: season=2/no-offset, large positive offset, offset yielding exactly Season 1
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
