In your lexer when lexical analysis is performed you may want to ignore any multiline C-like comments.
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Efstathios Chatzikyriakidis 
Ignoring multiline comments with start states in compilers with Flex.
In a previous article I have presented a way for ignoring multiline comments with an old fashion way.
In this article I’ll demonstrate a more elegant Flex-like way for ignoring multiline comments.
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