filter sequences of more than 3 ltr-rtl

1 files changed, 8 insertions, 0 deletions

diff --git a/src/main/java/de/pixart/messenger/utils/MessageUtils.java b/src/main/java/de/pixart/messenger/utils/MessageUtils.java
index 8a3cdb707..78be415f7 100644
--- a/src/main/java/de/pixart/messenger/utils/MessageUtils.java
+++ b/src/main/java/de/pixart/messenger/utils/MessageUtils.java
@@ -31,11 +31,15 @@ package de.pixart.messenger.utils;
 
 import java.net.MalformedURLException;
 import java.net.URL;
+import java.util.regex.Pattern;
 
 import de.pixart.messenger.entities.Message;
 import de.pixart.messenger.http.AesGcmURLStreamHandler;
 
 public class MessageUtils {
+
+    private static final Pattern LTR_RTL = Pattern.compile("(\\u200E[^\\u200F]*\\u200F){3,}");
+    private static final String EMPTY_STRING = "";
     public static String prepareQuote(Message message) {
         final StringBuilder builder = new StringBuilder();
         final String body = message.getMergedBody().toString();
@@ -79,4 +83,8 @@ public class MessageUtils {
             return false;
         }
     }
+
+    public static String filterLtrRtl(String body) {
+        return LTR_RTL.matcher(body).replaceFirst(EMPTY_STRING);
+    }
 }
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