diff --git a/ex02/src/main.c b/ex02/src/main.c
index 674d5a7..d81c780 100644
--- a/ex02/src/main.c
+++ b/ex02/src/main.c
@@ -277,8 +277,8 @@ bool parse_command(char* str, command* cmd) {
 			return true;
 		}
 		for (uint8_t k = 0; c[k]; k++) {
-			if (!(k >= 'a' && k <= 'z') && !(k >= 'A' && k <= 'Z') && !(k >= '0' && k <= '9') &&
-				k != '_' && k != '-') {
+			if (ft_stridx("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789-_",
+						  c[k]) == 255) {
 				uart_sendstring(
 					"Invalid format: SET_TAG parameter must be alphanumeric (- and _ are allowed "
 					"too)"