%%

%standalone
%class Calc

nl        =  \n|\r|\r\n
Number    =  (0|1)*.(00).(0|1)*
lang =  [0-1]+


%%

{Number}    {System.out.println("contain pair of zeros: " +yytext());}
 {lang}            {System.out.println("invalid: " +yytext());}


{nl}|" "|\t     {;}

.        {System.out.println("Error: " + yytext());}