... or github, neither of which I have.

Are you using Git or another VCS? Because if not, it's a really good idea, and Git / GitHub makes collaboration much easier.

I had expected a little more unanimity among the various responses, but I have discovered that everyone has a different perspective. At this point, it appears that no matter what I might choose, it has a good chance of displeasing the majority.

It's a community, not a centrally governed system with strict rules :-) Releasing useful, tested code publicly already gives you a lot of points, so it's unlikely to upset anyone unless you do so without thought in a top-level namespace; and it seems like you're putting a whole lot of thought into it. If you want to play it safe, start off in an X::Y::Z namespace; I think Thoughtstream gave some good advice in that respect above.

good chance of displeasing the majority

Regexp is definitely not the place to post character sets, definitely ... except that it is :) um, I changed my mind

well actually UTF8 definitely belongs nowhere , characters ranges aren't UTF8, this module doesn't deal with UTF8 ... sure the OP wrote

 
 $char = "...";  # some UTF8 string
[download]

but he meant some unicode string

So after some more research

Regexp::Cherokee - Regular Expressions Support for Cherokee Script. 
Regexp::Ethiopic - Regular Expressions Support for Ethiopic Script.
Regexp::CharClasses - Provide character classes
Regexp::EN::NumVerbage - Regex pattern to match English number verbage
+ in text 
Regexp::CharClasses - Provide character classes
[download]

I propose the one new namespace to rule them all Regexp::CharProps - User Defined Character Properties like \p{InKona}

So for the OP Regexp::CharProps::Thai - \p(InThaiDigit} and other thai language character properties definitions

So maybe

#!/usr/bin/perl --

=head1 NAME

Regexp::CharProps - User Defined Character Properties 

=head1 SYNOPSIS

    use Regexp::CharProps qw/ Thai /; ## like use Regexp::CharProps::T
+hai qw/ :all /;
                                      ## imports all exports like sub 
+InThaiPunct...
    
    print "\$_ has got Thai" if m{
        \p{InThai}
        |\p{InThaiCons}
        |\p{InThaiHCons}
        |\p{InThaiMCons}
        |\p{InThaiLCons}
        |\p{InThaiVowel}
        |\p{InThaiPreVowel}
        |\p{InThaiPostVowel}
        |\p{InThaiCompVowel}
        |\p{InThaiDigit}
        |\p{InThaiTone}
        |\p{InThaiPunct}
    }x;
    
    use Regexp::CharProps::Thai qw/ InThaiPunct /; ## not import :all 
+just sub InThaiPunct
    print "got Thai punctuation\n" if m/\p{InThaiPunct}/;

=cut


package Regexp::CharProps;
sub import {
    my( $class, @modsforall ) = @_;
    
    return if not @modsforall;
    
    my $target  = scalar caller;
    require Import::Into;
    for my $mod( @modsforall ){
        my $package = $class."::".$mod;
        $package ->import::into( $target , ':all' );
    }
}
1;
[download]

with accompanying EXPORT_TAGS

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