how to free yylval

[cwhite]

Hi,

I use 

yylval.string_type = strdup(yytext);

in my flex file but it seems that this is wasteful and it may cause memory
leaks. I thought that yytext gets replaced everytime the lexer is called so
how is this wasteful? How do I free yylval so that those don't happen?
Perhaps there is an alternative to strdup, I'd like to know what that is. 

Thanks.
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