Improve IP_PATTERN in DirectRTCClient in Android AppRTC Demo

webrtc/examples/androidapp/src/org/appspot/apprtc/DirectRTCClient.java

 /*
  *  Copyright 2016 The WebRTC Project Authors. All rights reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 24 matching lines @@
   private static final int DEFAULT_PORT = 8888;
 
   // Regex pattern used for checking if room id looks like an IP.
   static final Pattern IP_PATTERN = Pattern.compile(
       "("
         // IPv4
         + "((\\d+\\.){3}\\d+)|"
         // IPv6
         + "\\[((([0-9a-fA-F]{1,4}:)*[0-9a-fA-F]{1,4})?::"
               + "(([0-9a-fA-F]{1,4}:)*[0-9a-fA-F]{1,4})?)\\]|"
-        + "\\[(([0-9a-fA-F]{1,4}:)*[0-9a-fA-F]{1,4})\\]|"
+        + "\\[(([0-9a-fA-F]{1,4}:){7}[0-9a-fA-F]{1,4})\\]|"
         // IPv6 without []
         + "((([0-9a-fA-F]{1,4}:)*[0-9a-fA-F]{1,4})?::(([0-9a-fA-F]{1,4}:)*[0-9a-fA-F]{1,4})?)|"
-        + "(([0-9a-fA-F]{1,4}:)*[0-9a-fA-F]{1,4})|"
+        + "(([0-9a-fA-F]{1,4}:){7}[0-9a-fA-F]{1,4})|"
         // Literals
         + "localhost"
       + ")"
       // Optional port number
       + "(:(\\d+))?"
   );
 
   private final ExecutorService executor;
   private final SignalingEvents events;
   private TCPChannelClient tcpClient;
@@ skipping 286 matching lines @@
     return json;
   }
 
   // Converts a JSON candidate to a Java object.
   private static IceCandidate toJavaCandidate(JSONObject json) throws JSONException {
     return new IceCandidate(json.getString("id"),
         json.getInt("label"),
         json.getString("candidate"));
   }
 }