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+/*
+ * This file is part of flex.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE.
+ */
+
+%{
+/* This test is for correctness of extended (?...) patterns. */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include "config.h"
+
+%}
+
+%option 8bit prefix="test"
+%option nounput nomain noyywrap noinput
+%option warn
+
+
+%%
+
+    /* Output should match the input. */
+
+abc(?# Single Line Comment )def    ECHO;
+ghi(?#
+    multi-line
+    comment
+    )jkl                           ECHO;
+
+mno(?#
+    multi-line //
+    comment with ##
+    ~~!@#$ %^&*(@-_+=\|,.<>/ ?: ;
+    punctuation
+    )pqr                           ECHO;
+(?# Start of a rule.)stu           ECHO;
+vwxyz(?#End of a rule.)            ECHO;
+A(?x: B
+    /* comment */
+    C D)                           ECHO;
+
+\n                                 ECHO;
+%%
+
+int main(void);
+
+int
+main ()
+{
+    yyin = stdin;
+    yyout = stdout;
+    yylex();
+    //printf("TEST RETURNING OK.\n");
+    return 0;
+}