Re: "my" variables and recursive regexp strangeness

From: Anno Siegel (anno4000_at_lublin.zrz.tu-berlin.de)
Date: 05/13/04 

Date: 13 May 2004 14:00:55 GMT

Ian <ijnetnews@hotmail.com> wrote in comp.lang.perl.misc:
> I have something strange happening with a recursive regexp compiled
> with qr//x; It is a regular expression to match individual single
> double and un-quoted strings, i.e. "string", 'string' and string.
>
> It works fine when the sub parts of it are global variables, or
> "local" variables, but if I change them to "my" variables, suddenly
> they stop matching correctly (or at least start matching differently).
>
> Anybody have any ideas why changing to "my" variables would affect it
> this way?

It isn't the fact that they're lexical, but you apparently tried
to declare the variables in the same statement that uses them,
as in

    my $dStringData = qr/
        ([^"\\]|\\.)+ (??{$dStringData})
        |
        "
    /x;

You can't use a lexical in the same statement that declares it.
Use an extra "my" statement, and it works.

It would have been better to post the erroneous code, instead of
saying "if I change this, it doesn't work anymore". That way
we wouldn't have to guess your error.

Anno

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