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    How about reading the manual... You'll learn how to reference the matched portion, regardless of what's in the LHS. ;) Commented Jan 22, 2018 at 0:13
  • My bad, I meant $sed s/[0-9]/00/ as you can see, it has to be zero. I'm looking for a way for the digit to be the one found in the [0-9]. Commented Jan 22, 2018 at 0:20
  • "sed s/[0-9]/\0\0/" does the exact same as "sed s/[0-9]/00/" or am I missing something? Commented Jan 22, 2018 at 0:42
  • Yes. It becomes hew4r -> hew00r. I want hew44r. Also, why should I use that instead of "sed s/[0-9]/00/"? For this and the first example? Commented Jan 22, 2018 at 0:51
  • OK. in gnu sed using \0 refers to the previously matched regex. In bsd sed this is done using &. So in your case since \0 does not work, you can use sed 's/[0-9]/&&/'. Actuall using & will work even in gnu sed. Commented Jan 22, 2018 at 1:02