[plt-scheme] Possible bug in regexp?

Any news on the small example Jay identified?

Todd

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What's odd is that

(regexp-match?
       #rx"^\"([^\"#\u0000]| |#\return#\newline|#\tab|\\\\\")*\"$"
       "\")!\"")

succeeds, but

(regexp-match?
       #rx"^\"([^\"#\u0000-#\u0000]| |#\return#\newline|#\tab|\\\\\")*\"$"
       "\")!\"")

and

(regexp-match?
       #rx"^\"([^\"#\u0000-#\u0001]| |#\return#\newline|#\tab|\\\\\")*\"$"
       "\")!\"")

fail.
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