# Lowercase everything until end of group [duplicate]

What'd be the most efficient way of lowercasing everything from the point of the command invocation until the end of the group, that is, how should one define a command that acts like, for example, {\scshape ... }, just lowering the case of everything that follows. Let's for the beginning say that what follows is just plain text. (also wondering if LaTeX3 will make such text, or text+commands, manipulations any easier?)