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  1. or download this
    Input:
<xxx>...</xxx>
<p>...</p>
<xxx>...</xxx><xxx>...</xxx>
<p>...</p>
  2. or download this
    Output:
<1><xxx>...</xxx>
<p>...</p>
<2><xxx>...</xxx><3><xxx>...</xxx>
<p>...</p>
  3. or download this
       if(/<xxx>/){
    s/(<xxx>)/<$cnt>$1/;
    ++$cnt;
    }