sed match than replace rest of line code example

Example 1: sed replace from match to end of line

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 2: sed replace all until match in line

echo remove_staystay... | sed 's/.*\(stay.*\)/\1/g'
stay	#remove all but from last ocurrence match until end