cl-ppcre:split question

The examples for cl-ppcre:split here http://weitz.de/cl-ppcre/#split include this tempting recipe: (split "\\s+" "foo bar baz frob") => ("foo" "bar" "baz" "frob") However, (split "\\s+" " foo bar baz frob") => ("" "foo" "bar" "baz" "frob") I.e., the result list includes an empty string as the first element if there are one or more whitespace characters at the beginning of the string. How can I get rid of the empty string at the beginning? Is there a regexp match for this that would work with split? Thanks, Mark