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Jun 26th, 2019
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  1. a.b.
  2. a.b.com
  3. a.b.c.
  4. a.b.c.com
  5.  
  6. a.com
  7. a..b
  8. a.b.c..d
  9.  
  10. grep -P '^[^.]+.([^.]+.)+[.]+' file.txt | wc -l
  11.  
  12. [.]
  13.  
  14. grep
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