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fix(im): mattermost mention boundary handles usernames ending in -/. (#4322) - #4324
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…4322) Co-Authored-By: ggcode <noreply@ggcode.dev>
This was referenced Oct 19, 2026
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Closes #4322
根因(独立复核坐实)
RE2 \b 为 ASCII 词边界:Mattermost 用户名字符集 ^[a-z0-9.-_]+ 允许尾随 -/.,两侧均非词字符时 \b 数学上不可能匹配 → hasMention 漏判静默 return(无日志),stripMention 不剥离。
修复(RE2 无 lookahead,用字符集负边界)
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