private static String getKeyAfter(String name, int separatorIndex) {
        if (separatorIndex == -1 || separatorIndex >= name.length()) {
            return "";
        }
        return name.substring(separatorIndex + 1);
    }
Extract from given properties a list of string values. The prefix is used to determine the subset of the
given properties from which the list should be extracted, the rest is used as a numeric index. If the rest
is not numeric, the order is not determined (all those props are appended to the end of the list)

NOTE: If suffix/index is "._combine"  it is ignored!
This is reserved for combine policy tweaking.

@param prefix for selecting the properties from which the list should be extracted
@param properties properties from which to extract from
@return parsed list or null if no element with prefixes exists
src/main/java/io/fabric8/maven/docker/util/EnvUtil.java