It's hard to tell what a good solution would be without knowing more about the real problem. I can think of two trivial solutions.

• Use reverse to process the items in the opposite order.

  my $x = "<0>";
  
  for (reverse '<1>', '<2>', '<3>') {
     $x =~ s/(<0>)/${1}${_}/;
  }
  [download]

• Just do one replace.

  my $x = "<0>";
  
  $x =~ s/(<0>)/$1 . join('', '<1>', '<2>', '<3>')/e;
  [download]

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