Regex to replace last occurrence of a string in each line

Question

I am using sed -e \'s/\\(.*\\)ABC/\\1DEF/\' myfile to replace the last occurrence of ABC with DEF in a file.

I want to modify it

Answer 1

You need to add 'g' to the end of your sed:

sed -e 's/\(.*\)ABC/\1DEF/g'

This tells sed to replace every occurrence of your regex ("globally") instead of only the first occurrence.

EDIT: You should also add a $, if you want to ensure that it is replacing the last occurrence of ABC on the line:

sed -e 's/\(.*\)ABC$/\1DEF/g'