I have a file that has this format
[ 2014/05/01 10:48:26 | 13963 | DEBUG ] It took 11.16837501525879 seconds to complete the process
So I have thousands of lines like this and I would like to "extract" the
sed -e 's/^.* (\d+\.\d*)/\1/g' logfile.txt > out.txt
but I get:
sed: -e expression #1, char 21: invalid reference \1 on `s' command's RHS
What can I do here?