I created a macro variable numlist as the following: ONE|TWO|THREE|FOUR|FIVE|SIX|SEVEN|EIGHT|NINE|TEN|ELEVEN|TWELVE|THIRTEEN|FOURTEEN|FIFTEEN|SIXTEEN|SEVENTEEN|EIGHTEEN|NINETEEN|TWENTY|TWENTY-ONE|TWENTY-TWO|TWENTY-THREE|and so on. And format of $wordnum converts one to 1, two to 2, and so on. Now I need to use regular expression  to capture the word numbers like this: data have; var="abcd efgh ijkl WITH THREE mnop qrst"; output; var="abcd efgh ijkl W/ TWENTY-FIVE qrst"; output; run; %macro try;   data want;      set have;            %local re1;            %let re1=%sysfunc(prxparse(/(\s|\(|\)|-|#|[HW]\/ ?)(\d{1,3}|&numlist)\W*(mnop|qrst)/));            %if &re1 > 0 %then %do;                 %let pt_comments=%sysfunc(prxposn(&re1,2,var));                 var2 = put("&pt_comments",$wordnum.);            %end;   run; %mend; %try; proc print data=want; run; I’m expecting result of the following: var2 as 3 and 25, what did I do wrong in my program to create want? Thanks! obs     var                       var2 1 abcd efgh ijkl WITH THREE mnop qrst 3 2 abcd efgh ijkl W/ TWENTY-FIVE qrst 25 ... View more