[Python-ideas] fnmatch/glob with sub-expressions

I need to handle more advanced glob pattern matching than what glob/fnmatch provides. I need to support patterns like this: "a{b*c,d[ef]}" -> "a(b.*c|d[ef])$" "a{b{c,d},e}" -> "a(b(c|d)|e)$" This syntax is used in many shells, like bash and zsh, and other languages, like ruby. Does anyone else think this might be worthwhile in the standard library? It's a pretty simple change, but it could break code though, so we'd probably have to disable it by default.