Without knowing what you are trying to match, I'm just guessing, but my guess is that you want your regex to be something like this:

#!/usr/bin/env perl
use strict;
use warnings;
use feature 'say';

my $string = "<Word>Cat<Digit>1 blah blab blah <Word>Dog<Digit>0";

while ( $string =~ m/<Word>(\w+)<Digit>(\d+)/g ) {
    say "Matched Word: $1";
    say "Matched Digit: $2";
}

__END__
Matched Word: Cat
Matched Digit: 1
Matched Word: Dog
Matched Digit: 0
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