ROOT_NAME get root name
ROOT_NAME(P) returns the root name of P. root_name is the drive letter on Windows without the trailing slash or an empty string if P is not an absolute path. on non-Windows platforms, root_name is always an empty string.
function r = root_name(p) arguments p string end r = repmat("", size(p)); if ispc() i = startsWith(p, textBoundary + lettersPattern(1) + ":"); r(i) = extractBefore(p(i), 3); end end