Most bundles are supported by primary users - for instance the Ruby and Ruby on Rails bundles are supported by core developers for these languages libraries such as David Heinemeier Hansson, Ruby on Rails’ creator.
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TextMate uses the Oniguruma regular expression library developed by K. Kosako.
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These grammars allow nesting rules to be defined using the Oniguruma regular expression library, and then assigned specific “scopes”: compound labels which identify them for coloration.