public RegionInfo getOne(String region, String subregion) {
		if (isEmpty(subregion)) {
			return getOne(region);
		}

		RegionInfo regionInfo = getAll().get(region);
		if (regionInfo != null) {
			if (isEmpty(subregion) || regionInfo.getSubregion().contains(subregion)) {
				return regionInfo;
			}
		}
		throw new NGrinderRuntimeException(region + "." + subregion + " is not exist");
	}
Get region by region name

@param regionName region name
@return region info
ngrinder-controller/src/main/java/org/ngrinder/region/service/RegionService.java