public QuotaFilter setRegionServerFilter(final String regex) {
    this.regionServerRegex = regex;
    hasFilters |= StringUtils.isNotEmpty(regex);
    return this;
  }
Set the region server filter regex
@param regex the region server filter
@return the quota filter object
hbase-client/src/main/java/org/apache/hadoop/hbase/quotas/QuotaFilter.java