Regression: using underscores in template DEFINE variables yields unexpected behavior

Since 'DEFINE.+=' was changed to 'DEFINE \$[a-zA-Z0-9]+ =', DEFINE variables with underscores in them are not processed by phpbb_template_twig_lexer::fix_inline_variable_tokens() anymore. Seeing how the stock template files use more DEFINE vars with underscores in them than without, I'd say this isn't intended behaviour .