Regular Expression Perl

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#!/usr/bin/perl
use warnings;
use strict;
my $text = "one, two, three, four";
while ($text =~ /\b(\w+)\b/g) {
    print "outer: matched: $&, extracted: $1 \n";
    while ($1 =~ /(\w)/g) {
        print "\tinner: matched $&, extracted $1 \n";
    }
}