sed - Separate date and time with a comma -

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i have access log lines 

http://***.com ,**.**.**.**,2013-06-07 12:03:58 ,mozilla/5.0 (windows nt 6.1; wow64; rv:21.0) gecko/20100101 firefox/21.0.

i need date , time separated comma using sed

seems want this,

$ sed 's/\([0-9]\{4\}-[0-9]\{2\}-[0-9]\{2\}\) \([0-9]\{2\}:[0-9]\{2\}:[0-9]\{2\}\)/\1,\2/g' file http://***.com ,**.**.**.**,2013-06-07,12:03:58 ,mozilla/5.0 (windows nt 6.1; wow64; rv:21.0) gecko/20100101 firefox/21.0.
  • \([0-9]\{4\}-[0-9]\{2\}-[0-9]\{2\}\) capture date string.
  • match in-between space character.
  • \([0-9]\{2\}:[0-9]\{2\}:[0-9]\{2\}\) capture time string.
  • then replace matched strings \1 characters inside group index 1, , \2 characters inside group index 2.
  • \(\) called capturing group in basic regular expressions. example \([0-9]\{4\}\) capture 4 digit number group.

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