diff --git a/demo/shitgrep.c b/demo/shitgrep.c
index 1064c22..84c9d5d 100644
--- a/demo/shitgrep.c
+++ b/demo/shitgrep.c
@@ -12,6 +12,11 @@
 
 #define BUFFER_START_CAPACITY 128
 
+#define PREFIX ".*("
+#define PREFIX_LEN 3
+#define SUFFIX ").*"
+#define SUFFIX_LEN 3
+
 int main(int argc, char *argv[])
 {
 	if (argc != 2) {
@@ -19,8 +24,15 @@ int main(int argc, char *argv[])
 		return EXIT_FAILURE;
 	}
 
+	const int input_len = strlen(argv[1]);
+	const int regex_len = input_len + 6;
+	char *regex = malloc(regex_len);
+	memcpy(regex, PREFIX, PREFIX_LEN);
+	memcpy(regex + PREFIX_LEN, argv[1], input_len);
+	memcpy(regex + PREFIX_LEN + input_len, SUFFIX, SUFFIX_LEN);
+
 	fsa_t dfa;
-	if (!compile(argv[1], strlen(argv[1]), &dfa)) {
+	if (!compile(regex, regex_len, &dfa)) {
 		fprintf(stderr, "Failed to parse regex\n");
 		return EXIT_FAILURE;
 	}