Case insensitive conservative substitution

Question

Is there a built-in way in Vim to search for a pattern in a case-insensitive way, and substituting the occurrence conserving its case? (Something like an s/abcd/efgh that matches AbCd and replaces it with EfGh.)

Answer 1

There are ways to match characters case-sensitively, and replacement special forms that uppercase or lowercase their arguments, but there is not a native way to do that.

However, tpope has the excellent vim-abolish which provides a command :Subvert that can accomplish this