+ $search = $replace if @_ < 3;
+
+ # generate a single regex to emulate smart match
+ $search = [$search] unless ref $search eq 'ARRAY';
+ @$search = grep { defined } @$search;
+ $search = @$search ? join('|', map { ref $_ ? $_ : "^\Q$_\E\$" } @$search) : undef;
+