Several flex scanners share common rules/definitions?

I have two scanners that use basically the same regular expressions
and differ only in a few details. How can I write the two lex files so
that I don't have to write the common things twice?


For example, my tow scanners both use these and several other
definitions and rules:


digit [0-9]
octet [0-7]
hexet [0-9a-fA-F]
uAlpha [A-Z]
lAlpha [a-z]
alpha ({uAlpha}|{lAlpha})


%%


\n { lineNum++; }
{digit}+ { process_digit(yytext); }
...


I don't want to write this again and again for each scanner that uses
these. How can I make a kind of scanner base class? Or can I just
include these basic common rules in each of my scanners?


Thanks
Markus

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