diff --git a/chat/src/main/java/com/qiscus/sdk/util/QiscusPatterns.java b/chat/src/main/java/com/qiscus/sdk/util/QiscusPatterns.java
index 183457bb2..a9be366c3 100644
--- a/chat/src/main/java/com/qiscus/sdk/util/QiscusPatterns.java
+++ b/chat/src/main/java/com/qiscus/sdk/util/QiscusPatterns.java
@@ -16,12 +16,15 @@
 
 package com.qiscus.sdk.util;
 
+import android.support.annotation.RestrictTo;
+
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
 
 /**
  * Commonly used regular expression patterns.
  */
+@RestrictTo(RestrictTo.Scope.LIBRARY)
 public class QiscusPatterns {
     /**
      * Regular expression to match all IANA top-level domains.
@@ -162,8 +165,6 @@ public class QiscusPatterns {
      * List accurate as of 2015/11/24.  List taken from:
      * http://data.iana.org/TLD/tlds-alpha-by-domain.txt
      * This pattern is auto-generated by frameworks/ex/common/tools/make-iana-tld-pattern.py
-     *
-     * @hide
      */
     static final String IANA_TOP_LEVEL_DOMAINS = "(?:com|net|org|biz|id|co.id)";
 
@@ -347,9 +348,7 @@ public class QiscusPatterns {
 
     /**
      * Regular expression pattern to match email addresses. It excludes double quoted local parts
-     * and the special characters #&~!^`{}/=$*?| that are included in RFC5321.
-     *
-     * @hide
+     * and the special characters that are included in RFC5321.
      */
     public static final Pattern AUTOLINK_EMAIL_ADDRESS = Pattern.compile("(" + WORD_BOUNDARY +
             "(?:" + EMAIL_ADDRESS_LOCAL_PART + "@" + EMAIL_ADDRESS_DOMAIN + ")" +