[plt-scheme] Possible bug in regexp?

So the real error is that the pattern says to disallow all characters
between 0 and #?

I will fix that when I get in.

Jay

On Tue, Apr 27, 2010 at 7:07 AM, Matthew Flatt <mflatt at cs.utah.edu> wrote:
> At Tue, 27 Apr 2010 08:52:53 -0400, "Todd O'Bryan" wrote:
>>
>> (regexp-match?
>>        #rx"^\"([^\"#\u0000]| |#\return#\newline|#\tab|\\\\\")*\"$"
>>        "\")!\"")
>>
>> succeeds, but
>
> I think that was meant to be
>
>  (regexp-match?
>        #rx"^\"([^\"\u0000]| |\r\n|\t|\\\\\")*\"$"
>        "\")!\"")
>
> That is, the syntax for character escapes in a string is different from
> the syntax of character literals.
>
>> (regexp-match?
>>        #rx"^\"([^\"#\u0000-#\u0000]| |#\return#\newline|#\tab|\\\\\")*\"$"
>>        "\")!\"")
>
> The expression
>
>  (regexp-match?
>        #rx"^\"([^\"\u0000-\u0000]| |\r\n|\t|\\\\\")*\"$"
>        "\")!\"")
>
> produces #t.
>
>> (regexp-match?
>>        #rx"^\"([^\"#\u0000-#\u0001]| |#\return#\newline|#\tab|\\\\\")*\"$"
>>        "\")!\"")
>
> The expression
>
>  (regexp-match?
>        #rx"^\"([^\"\u0000-\u0001]| |\r\n|\t|\\\\\")*\"$"
>        "\")!\"")
>
> also produces #t.
>
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-- 
Jay McCarthy <jay at cs.byu.edu>
Assistant Professor / Brigham Young University
http://teammccarthy.org/jay

"The glory of God is Intelligence" - D&C 93