How does backreferences affect performance or memory usage?

Perl, Backreferences, Performance, Memory Usage, Regular Expressions
Exploring how backreferences in Perl can affect performance and memory usage when working with regular expressions. 

# Example of using backreferences in Perl
my $string = "one fish, two fish, red fish, blue fish";
if ($string =~ /(\w+) fish.*\1 fish/) {
    print "The string has repeated fish!";
}

Perl Backreferences Performance Memory Usage Regular Expressions

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