Matcher matcher = FeedDataPath.DATE_FIELD_PATTERN.matcher(mask);
int start = 0;
while (matcher.find(start)) {
String subMask = mask.substring(matcher.start(), matcher.end());
String subPath = path.substring(matcher.start(), matcher.end());
VARS var = VARS.from(subMask);
if (!map.containsKey(var)) {
map.put(var, subPath);
}
start = matcher.start() + 1;
}