I am afraid I don't understand.
If you have line:
1.xxxxx 2.xxxxx 1.xxxxx 2.xxxxx 1.xxxxx 2.xxxxx 3.xxxxx 1.xxxxx 2.xxxxx
and you want to split it into separates line:
1.xxxxx 
2.xxxxx 
1.xxxxx 
2.xxxxx 
1.xxxxx 
2.xxxxx 
3.xxxxx 
1.xxxxx 
2.xxxxx

The regular expression you mentioned works (tested just now). If you use
backward replace, you must start on the end of file.
But I don't understand what should be result of sorting.

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