static public boolean isPattern(String pattern) {
		return pattern.contains("?") || pattern.contains("*");
	}
Returns the extension of the given file name. The extension will not include
the dot as part of the result. Returns an empty string if the name has no
extension.

@param name A file name
@return An extension or an empty string
src/main/java/dev/jbang/util/Util.java