This seems to work: data first_try;
set long_string;
match1 = prxmatch(catt("m/(",lowcase(keyp1),")/oi"),txt);
match2 = prxmatch(catt("m/(",lowcase(keyp2),")/oi"),txt);
match3 = prxmatch(catt("m/(",lowcase(keyp3),")/oi"),txt);
match4 = prxmatch(catt("m/(",lowcase(keyp4),")/oi"),txt);
run; I don't quite understand why my array is not working: data final;
set long_string;
array keyp{4} $ keyp1-keyp4;
array match{4} match1-match4;
do i=1 to 4;
match[i] = prxmatch(catt("m/(",lowcase(keyp[i]),")/oi"),txt);
end;
run;
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