helix-core/src/main/java/org/apache/helix/util/HelixUtil.java [78:88]:
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  public static String getInstanceNameFromPath(String path) {
    // path structure
    // /<cluster_name>/instances/<instance_name>/[currentStates/messages]
    if (path.contains("/" + PropertyType.INSTANCES + "/")) {
      String[] split = path.split("\\/");
      if (split.length > 3) {
        return split[3];
      }
    }
    return null;
  }
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helix-core/src/main/java/org/apache/helix/PropertyPathBuilder.java [243:253]:
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  public static String getInstanceNameFromPath(String path) {
    // path structure
    // /<cluster_name>/instances/<instance_name>/[currentStates/messages]
    if (path.contains("/" + PropertyType.INSTANCES + "/")) {
      String[] split = path.split("\\/");
      if (split.length > 3) {
        return split[3];
      }
    }
    return null;
  }
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