RegEx question

[Ron]

I have been using the below subroutine for Parsing my data from forms.  The
question I have; can someone explain this line to me,
$value =~ tr/+/ /;

The tr has me a bit confused.

Thank you for any input,
Ron

====================================================
sub Parse_Form {
if ($ENV{'REQUEST_METHOD'} eq 'GET') {
        @pairs = split(/&/, $ENV{'QUERY_STRING'});
} elsif ($ENV{'REQUEST_METHOD'} eq 'POST') {
        read (STDIN, $buffer, $ENV{'CONTENT_LENGTH'});
        @pairs = split(/&/, $buffer);
} else {
        print "Content-type: text/html\n\n";
        print "<P>Use Post or Get</P>";
}

foreach $pair (@pairs) {
        ($key, $value) = split (/=/, $pair);
        $key =~ tr/+/ /;
        $key =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C", hex($1))/eg;
        $value =~ tr/+/ /;
        $value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C", hex($1))/eg;

        $value =~ s/<!--(.|\n)*-->//g;

        if ($formdata{$key}) {
                $formdata{$key} .= ", $value";
        } else {
                $formdata{$key} = $value;
        }
}
}
1;



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