sed replace part of string code example
Example 1: linux replace string in all files
sed -i 's/old-text/new-text/g' input.txt
Example 2: sed replace in file
sed -i 's/foo/bar/g' hello.txt
Example 3: replace using sed
sed -i -e 's/old-text/new-text/g' text.txt
Example 4: sed replace from match
Just use a similar example with using ".*" regex with sed as following:
sed 's/match_pattern.*/replacement_of_match_and_rest_of_line/' file.txt
Example 5: sed replace
For using match in sed replacement, just border it with '\(' and '\)':
echo Before123 | sed 's/Before\([0-9]*\)/\1After/g'
123After
Example with 2 match replacements
echo a_b | sed 's/\(^.*\)_\(.*$\)/first is \1 and \2 is after/g'