$var =~ s/$lhs/$rhs/ee;
$var =~ s/$lhs/eval $rhs/e;
(Except that exceptions aren't caught.)
That means $rhs must contain valid Perl code, yet $1$2$3 is not valid Perl code. "$1$2$3" or $1.$2.$3 would be valid Perl code, so you want
$rhs = '"$1$2$3"';
$rhs = '$1.$2.$3';
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