Question

Possible Duplicate:
problem getting c-style comments in flex/lex

I am writing a lexical analyzer using flex how can I make it avoid the comments that look
like this:

/* COMMENTS */

Answer 1

It is a bit complicated. Here is a solution I found:

<INITIAL>{
"/*"              BEGIN(IN_COMMENT);
}
<IN_COMMENT>{
"*/"      BEGIN(INITIAL);
[^*\n]+   // eat comment in chunks
"*"       // eat the lone star
\n        yylineno++;
} { return COMMENT; }

The “obvious” solution, something like this:

"/*".*"*/" { return COMMENT; }

will match too much.