This is the difference:
$ yes | nl | perl -ne 'print if /00/../0/' | head -n20
   100  y
   200  y
   300  y
   400  y
   500  y
   600  y
   700  y
   800  y
   900  y
  1000  y
  1001  y
  1002  y
  1003  y
  1004  y
  1005  y
  1006  y
  1007  y
  1008  y
  1009  y
  1100  y
$ yes | nl | perl -ne 'print if /00/.../0/' | head -n20
   100  y
   101  y
   200  y
   201  y
   300  y
   301  y
   400  y
   401  y
   500  y
   501  y
   600  y
   601  y
   700  y
   701  y
   800  y
   801  y
   900  y
   901  y
  1000  y
  1001  y

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In reply to Re^6: get data from the database -CGI by choroba
in thread parsing a txt file by baxy77bax

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