function reFilenamePosix() {
	return /^(\/?|)([\s\S]*?)((?:\.{1,2}|[^\/]+?|)(\.[^.\/]*|))(?:[\/]*)$/; // eslint-disable-line no-useless-escape
}
Returns a regular expression to split a POSIX filename.

@returns {RegExp} regular expression

@example
var RE_FILENAME_POSIX = reFilenamePosix();
var parts = RE_FILENAME_POSIX.exec( '/foo/bar/index.js' ).slice();
// returns [ '/foo/bar/index.js', '/', 'foo/bar/', 'index.js', '.js' ]