find function is not working into a macro function

[alepage]

The find function is not working ????

%macro find_example1();
    %let my_string =This is a test string;
    %let substring =test;
    %let position = %sysfunc(find(&my_string, &substring));
    %put Position = &position; /* Expected output: Position = 11 */
%mend;

%find_example1;

%macro find_example2();
    %let my_string ="This is a test string;";
    %let substring ="test";
    %let position = %sysfunc(find(&my_string, &substring));
    %put Position = &position; /* Expected output: Position = 11 */
%mend;

%find_example2;

How to solve this issue

[data_null__ · Accepted solution]

I think you need some & ampersands.

65         %macro find_example1();
66             %let my_string =This is a test string;
67             %let substring =test;
68             %let position = %sysfunc(find(&my_string, &substring));
69             %put Position = &position; /* Expected output: Position = 11 */
70         %mend;
71         
72         %find_example1;
Position = 11
73         
74         %macro find_example2();
75             %let my_string ="This is a test string;";
76             %let substring ="test";
77             %let position = %sysfunc(find(&my_string, %sysfunc(dequote(&substring))));
78             %put Position = &position; /* Expected output: Position = 11 */
79         %mend;
80         
81         %find_example2;
Position = 12