public static boolean isStartWith(final IDeviceID deviceID, final String storageGroup) {
    return deviceID.segmentNum() > 0 && deviceID.matchDatabaseName(storageGroup);
  }
Return true if the str is a real number. Examples: 1.0; +1.0; -1.0; 0011; 011e3; +23e-3
iotdb-core/node-commons/src/main/java/org/apache/iotdb/commons/utils/PathUtils.java