If more than one iteration is needed, you can use a loop with a "change" flag: 
my $change = 1;
while ($change) {
    $change = 0;
    $change ||= s/^($pattern)/$h_orig->{$1}/g
        for values %copy;
}

[download]

map{substr$_->[0],$_->[1]||0,1}[\*||{},3],[[]],[ref qr-1,-,-1],[{}],[sub{}^*ARGV,3]

In reply to Re^2: Replacing substrings with links by choroba
in thread Replacing substrings with links by ovedpo15

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