SAS v9.2 introduces macro option mindelimiter. This option simplifies the IN operation in a macro environment. Here is an example to illustrate the usage of the option.

options minoperator;
%macro test(value)/mindelimiter=',';

%if &value in 1,2,3,4,5,6 %then  %put Value found within list.;
%else                                          %put Value not in list.;

%mend;

%test(3)
%test(8)

*******************************;
30   options minoperator;
31   %macro test(value)/mindelimiter=',';
32
33   %if &value in 1,2,3,4,5,6 %then  %put Value found within list.;
34   %else                                          %put Value not in list.;
35
36   %mend;
37
38   %test(3)
Value found within list.
39   %test(8)
Value not in list.