Hi, Thanks for your support and advice. I adapted a bit L~R's code, but it basically is the same thing, lvalue subs redirected through tied variables. Below I give you what is most relevant, that is the end-user experience.

Creating a property-based class

package MyClass;

use strict;

use ObsceneEnabler;

our @properties = (
     "Name",
     "RegExp",
);

####################################
# Register properties for this class
####################################

ObsceneEnabler::RegisterProperties (@properties);


########################
# Class definition below
########################

sub get_RegExp {
     my $this = shift;

     unless ($this->regExp) {
          return "(?:" . $this->Name . ")";
     }

     return $this->regExp;
}


sub set_RegExp {
     my $this = shift;
     my $regexp = shift;
     $this->regExp = "(?:$regexp)";
}


sub SetMultiRegExp {
     my $this = shift;
     my $regexp = join ("|", @_);

     $this->RegExp = $regexp;
}


1;
[download]

Using a property-based class

use strict;

use MyClass;

my $o = new MyClass;
# Properties may also be initialized at construction time.
# my $o = new MyClass ({ RegExp => "Initial RegExp" });

$o->Name = "New Name";

print "Name: `" . $o->Name . "'\n";
print "RegExp: `" . $o->RegExp . "'\n";

$o->RegExp = "My RegExp";
print "RegExp: `" . $o->RegExp . "'\n";

$o->SetMultiRegExp ("My RegExp", "My Second RegExp");
print "Multi-set RegExp: `" . $o->RegExp . "'\n";

$o->regExp = "Hacked RegExp";
[download]

The output is:

Name: `New Name'
RegExp: `(?:New Name)'   (or RegExp: `(?:Initial RegExp)')
RegExp: `(?:My RegExp)'
Multi-set RegExp: `(?:My RegExp|My Second RegExp)'
Attempting to access private field `regExp'
[download]

Cheers, PerlDeveloper