As far as I know, you can't introduce a new quotelike operator akin to your example 

$my_object_of_class_A =~ qclassB/$string/

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only redefine the meanings of existing ones or create your objects with an explicit function/method call.

I think, however, within some limits, you can create an object you can apply to a string with the =~ operator but behaives in a custom way. For this, you have to use the /(?{})/ regexp feature. The code inside this construct can access the matched string from the $^N provided you put a /\A(?=.*\z)/s capture before the construct that captures the entire string. Then, the code can do whatever computations with the string to decide if it wants to return a match or a non-match.

Here's a simple proof-of-concept example. 

use warnings; use strict; 

sub len_3mult {
        my($s) = @_; 
        0 == length($s) % 3;
}
my $len_3mult = qr/\A(.*)\z(?(?{ len_3mult($^N) })|(?!))/s;  

for my $s (qw"my his your their socket connect protocol terminate") {
        if ($s =~ /$len_3mult/) {
                print "<<$s>> matches\n";                             
+             
        } else {
                print "<<$s>> does not match\n"
        }
}

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As you can see, the regexp $len_3mult matches only if the length of the string is a multiply of three or more characters. You could replace this condition with arbitary perl code.

I don't know if you can return arbitary captures ($1, $2, ..., @-, @+) from such a regexp.

In reply to Re: overload =~ operator by ambrus
in thread overload =~ operator by dk

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