protected static String getSettingsQualifierRegexForUserTable(final String table) {
    return '^' + Pattern.quote(Bytes.toString(QUOTA_QUALIFIER_SETTINGS_PREFIX)) + table + "(?<!"
      + Pattern.quote(Character.toString(TableName.NAMESPACE_DELIM)) + ")$";
  }
Returns the current space quota snapshot of the given {@code tableName} from
{@code QuotaTableUtil.QUOTA_TABLE_NAME} or null if the no quota information is available for
that tableName.
@param conn      connection to re-use
@param tableName name of the table whose current snapshot is to be retreived
hbase-client/src/main/java/org/apache/hadoop/hbase/quotas/QuotaTableUtil.java