ingestion-beam/src/main/java/com/mozilla/telemetry/decoder/ParsePayload.java [393:406]:
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  static String normalizeUuid(String v) {
    if (v == null) {
      return null;
    }
    // The impression_id in activity-stream pings is a UUID enclosed in curly braces, so we
    v = v.replaceAll("[{}]", "");
    try {
      // Will raise an exception if not a valid UUID.
      UUID.fromString(v);
      return v.toLowerCase();
    } catch (IllegalArgumentException ignore) {
      return null;
    }
  }
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ingestion-beam/src/main/java/com/mozilla/telemetry/decoder/ipprivacy/ExtractClientIdAndDropPayload.java [81:94]:
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  static String normalizeUuid(String v) {
    if (v == null) {
      return null;
    }
    // The impression_id in activity-stream pings is a UUID enclosed in curly braces, so we
    v = v.replaceAll("[{}]", "");
    try {
      // Will raise an exception if not a valid UUID.
      UUID.fromString(v);
      return v.toLowerCase();
    } catch (IllegalArgumentException ignore) {
      return null;
    }
  }
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