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Flex supports C-style comments, that is, anything between ‘/*’ and ‘*/’ is considered a comment. Whenever flex encounters a comment, it copies the entire comment verbatim to the generated source code. Comments may appear just about anywhere, but with the following exceptions:
If you want to follow a simple rule, then always begin a comment on a new line, with one or more whitespace characters before the initial ‘/*’). This rule will work anywhere in the input file.
All the comments in the following example are valid:
%{ /* code block */ %} /* Definitions Section */ %x STATE_X %% /* Rules Section */ ruleA /* after regex */ { /* code block */ } /* after code block */ /* Rules Section (indented) */ <STATE_X>{ ruleC ECHO; ruleD ECHO; %{ /* code block */ %} } %% /* User Code Section */