That seems to produce the same result, namely:

string is now Goodbye \1

#!/usr/bin/perl
use strict;
use diagnostics;
use warnings;

my $string = 'Hello sailor';
my $regex = 'Hello (.*)';
my $substitution = 'Goodbye \\1';

$string =~ s/$regex/$substitution/;
print "string is now $string \n";

# I wanted:     string is now Goodbye sailor
# I got:          string is now Goodbye \1

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In reply to Re^2: Substitution backreference woes by Anonymous Monk
in thread Substitution backreference woes by Anonymous Monk

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