Delete lines between matches in regex

Delete all lines between two matching patterns including the matchings patterns

sed ‘/pattern1/,/pattern2/d’ input.txt

(apply delete command d to whole match)

https://stackoverflow.com/questions/57845053/using-sed-to-delete-all-lines-between-two-matching-patterns-including-the-matche

Delete all lines between two mathing patterns, excluding the matchings patterns

sed ‘/pattern1/,/pattern/{//!d}’ input.txt

(apply delete command d only if line does not match the pattern)

https://stackoverflow.com/questions/6287755/using-sed-to-delete-all-lines-between-two-matching-patterns

Note: the d operator can be any other sed operator

 sed '/pattern1/,/^pattern2/{//!s|.*|NEW_STUFF|)|}' CMakeLists.txt