The following works without using any explicit
iterations. I haven't clocked its execution against the
others, though.
$s = 'abc nbc cbs fox hbo sho cnn rox';
($orig, $num, $subst) = ('n', 2, '-');
$s =~ s/^(([^$orig]*$orig){$num})(.*)/$1/;
($t = $3) =~ s/$orig/$subst/g;
$s .= $t;
print $s
This prints:
abc nbc cbs fox hbo sho cn- rox
It works by cutting the string into two parts, applying the
substitution to the second part (if there is one) and
rejoining them.
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