Thank you guys, I just figured out the way after long trial with myself from when I post this topic to right now without any break: 
foreach (keys %$reg) {
    no strict 'refs';
    my $regkey = $_ or next;
    my $regval = $reg->{$regkey} or next;
    my $sub = sub {
        return 1 if shift =~ /$regval/;
    };
    *{'is_'.$regkey} = $sub;
}

our @EXPORT = do {
    no strict 'refs';
    my @list;
    foreach (keys %Str::) {
        eval {my $sub = *$_{CODE};};
        push @list, $_ if !$@;
    }
    @list;
};

[download]
I did not need AUTOLOAD at all. Thank you again, I'm going to read your answers from now!

In reply to Re^2: How to export un-exist subroutines by ryo0ka
in thread How to export un-exist subroutines by ryo0ka

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.