How to ignore some differences in diff command?

Question

diff has an option -I regexp, which ignores changes that just insert or delete lines that match the given regexp. I need an analogue of this for the ca

Answer 1

You could filter the two files through sed to eliminate the lines you don't care about. The general pattern is /regex1/,/regex2/ d to delete anything between lines matching two regexes. For example:

diff <(sed '/abXd/,/abYd/d' file1) <(sed '/abXd/,/abYd/d' file2)