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Ensures compatibility with https://github.com/github-linguist/linguist
This isn't invalid per the TextMate grammar spec - it's a constraint of the classic PCRE library that GitHub Linguist/github.com use to validate and render grammars. PCRE requires lookbehind assertions to have a fixed length, while Oniguruma (used by VS Code/Sublime) does not have this restriction, which is why this only breaks GitHub.com highlighting.