http://www.perlmonks.org?node_id=173960


in reply to Ignore case of query string parameter

Other monks may have a specific way to do what you want, but you might also find it useful that CGI.pm (I think I'm right in guessing you are using this?) offers: @array_of_submitted_parameter_names = $query->param; So you could get them all and then loop through them picking up the ones that meet your needs, e.g. in the case you're looking at: 
my @ary = $query->param;
my $pageid;
for (@ary) {
    if (lc $_ eq 'pageid') {
        $pageid = $query->param($_);
    }
}

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§ George Sherston

In Section Seekers of Perl Wisdom