diff --git a/main.cc b/main.cc
index a0767a8..2a60452 100644
--- a/main.cc
+++ b/main.cc
@@ -1,5 +1,6 @@
 #include <oniguruma.h>
 #include <stdio.h>
+#include <string.h>
 
 int main(int argc, char * argv[])
 {
@@ -20,5 +21,19 @@ int main(int argc, char * argv[])
         return 1;
     }
 
+    static const char pattern[] = "\\<Foo\\d";
+    OnigErrorInfo einfo;
+    regex_t regex;
+    rc = onig_new_without_alloc(&regex, (const OnigUChar *)pattern,
+            (const OnigUChar *)(pattern + strlen(pattern)), ONIG_OPTION_NONE,
+            ONIG_ENCODING_UTF8, ONIG_SYNTAX_DEFAULT, &einfo);
+    if (rc != ONIG_NORMAL)
+    {
+        OnigUChar s[ONIG_MAX_ERROR_MESSAGE_LEN];
+        onig_error_code_to_str(s, rc, &einfo);
+        fprintf(stderr, "Error: %s\n", s);
+        return 1;
+    }
+
     return 0;
 }