What other parameters other than \U does sed have?

Question

I already knew sed\'s \\1, \\2, ... , \\n and recently discovered that it has a useful \\U option to create

Answer 1

According to the links CodeGnome passed, those are:

\L Turn the replacement to lowercase until a \U or \E is found,

\l Turn the next character to lowercase,

\U Turn the replacement to uppercase until a \L or \E is found,

\u Turn the next character to uppercase,

\E Stop case conversion started by \L or \U.