diff --git a/app/build.gradle b/app/build.gradle
index 57399f45..ae211bd8 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -6,8 +6,8 @@ android {
         applicationId "ml.docilealligator.infinityforreddit"
         minSdkVersion 21
         targetSdkVersion 30
-        versionCode 52
-        versionName "4.1.1"
+        versionCode 53
+        versionName "4.2.0-beta1"
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
         javaCompileOptions {
             annotationProcessorOptions {
diff --git a/app/src/main/java/ml/docilealligator/infinityforreddit/activities/PostFilterPreferenceActivity.java b/app/src/main/java/ml/docilealligator/infinityforreddit/activities/PostFilterPreferenceActivity.java
index ebcc8453..f75f08f7 100644
--- a/app/src/main/java/ml/docilealligator/infinityforreddit/activities/PostFilterPreferenceActivity.java
+++ b/app/src/main/java/ml/docilealligator/infinityforreddit/activities/PostFilterPreferenceActivity.java
@@ -59,6 +59,8 @@ public class PostFilterPreferenceActivity extends BaseActivity {
     protected void onCreate(Bundle savedInstanceState) {
         ((Infinity) getApplication()).getAppComponent().inject(this);
 
+        setImmersiveModeNotApplicable();
+
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_post_filter_preference);
 
diff --git a/app/src/main/java/ml/docilealligator/infinityforreddit/activities/PostFilterUsageListingActivity.java b/app/src/main/java/ml/docilealligator/infinityforreddit/activities/PostFilterUsageListingActivity.java
index 482b1171..daf9a704 100644
--- a/app/src/main/java/ml/docilealligator/infinityforreddit/activities/PostFilterUsageListingActivity.java
+++ b/app/src/main/java/ml/docilealligator/infinityforreddit/activities/PostFilterUsageListingActivity.java
@@ -70,6 +70,8 @@ public class PostFilterUsageListingActivity extends BaseActivity {
     protected void onCreate(Bundle savedInstanceState) {
         ((Infinity) getApplication()).getAppComponent().inject(this);
 
+        setImmersiveModeNotApplicable();
+
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_post_filter_application);
 
diff --git a/app/src/main/java/ml/docilealligator/infinityforreddit/postfilter/PostFilter.java b/app/src/main/java/ml/docilealligator/infinityforreddit/postfilter/PostFilter.java
index 63e26ee3..5eaf70bc 100644
--- a/app/src/main/java/ml/docilealligator/infinityforreddit/postfilter/PostFilter.java
+++ b/app/src/main/java/ml/docilealligator/infinityforreddit/postfilter/PostFilter.java
@@ -118,8 +118,8 @@ public class PostFilter implements Parcelable {
             return false;
         }
         if (postFilter.postTitleExcludesRegex != null && !postFilter.postTitleExcludesRegex.equals("")) {
-            Pattern spoilerPattern = Pattern.compile(postFilter.postTitleExcludesRegex);
-            Matcher matcher = spoilerPattern.matcher(postFilter.postTitleExcludesRegex);
+            Pattern pattern = Pattern.compile(postFilter.postTitleExcludesRegex);
+            Matcher matcher = pattern.matcher(post.getTitle());
             if (matcher.find()) {
                 return false;
             }
@@ -127,7 +127,7 @@ public class PostFilter implements Parcelable {
         if (postFilter.postTitleExcludesStrings != null && !postFilter.postTitleExcludesStrings.equals("")) {
             String[] titles = postFilter.postTitleExcludesStrings.split(",", 0);
             for (String t : titles) {
-                if (post.getTitle().contains(t)) {
+                if (!t.equals("") && post.getTitle().contains(t)) {
                     return false;
                 }
             }
@@ -135,7 +135,7 @@ public class PostFilter implements Parcelable {
         if (postFilter.excludeSubreddits != null && !postFilter.excludeSubreddits.equals("")) {
             String[] subreddits = postFilter.excludeSubreddits.split(",", 0);
             for (String s : subreddits) {
-                if (post.getSubredditName().equalsIgnoreCase(s)) {
+                if (!s.equals("") && post.getSubredditName().equalsIgnoreCase(s)) {
                     return false;
                 }
             }
@@ -143,7 +143,7 @@ public class PostFilter implements Parcelable {
         if (postFilter.excludeUsers != null && !postFilter.excludeUsers.equals("")) {
             String[] users = postFilter.excludeUsers.split(",", 0);
             for (String u : users) {
-                if (post.getAuthor().equalsIgnoreCase(u)) {
+                if (!u.equals("") && post.getAuthor().equalsIgnoreCase(u)) {
                     return false;
                 }
             }
@@ -151,7 +151,7 @@ public class PostFilter implements Parcelable {
         if (postFilter.excludeFlairs != null && !postFilter.excludeFlairs.equals("")) {
             String[] flairs = postFilter.excludeFlairs.split(",", 0);
             for (String f : flairs) {
-                if (post.getFlair().equalsIgnoreCase(f)) {
+                if (!f.equals("") && post.getFlair().equalsIgnoreCase(f)) {
                     return false;
                 }
             }
@@ -159,7 +159,7 @@ public class PostFilter implements Parcelable {
         if (postFilter.containFlairs != null && !postFilter.containFlairs.equals("")) {
             String[] flairs = postFilter.containFlairs.split(",", 0);
             for (String f : flairs) {
-                if (post.getFlair().equalsIgnoreCase(f)) {
+                if (!f.equals("") && post.getFlair().equalsIgnoreCase(f)) {
                     return false;
                 }
             }
diff --git a/app/src/main/res/values-zh-rCN/strings.xml b/app/src/main/res/values-zh-rCN/strings.xml
index e27facdb..1b2cedd4 100644
--- a/app/src/main/res/values-zh-rCN/strings.xml
+++ b/app/src/main/res/values-zh-rCN/strings.xml
@@ -929,5 +929,5 @@ https://play.google.com/store/apps/details?id=ml.docilealligator.infinityforredd
     <string name="theme_item_no_preview_post_type_background_color">"无预览文章类型背景颜色"</string>
     <string name="theme_item_no_preview_post_type_background_color_detail">"应用于：占位符，指示没有预览可用时的帖子类型"</string>
     <string name="settings_language_title">"语言"</string>
-    <string name="settings_enable_search_history">"启用搜索记录"</string>
+    <string name="settings_enable_search_history_title">"启用搜索记录"</string>
 </resources>
\ No newline at end of file
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 008e99e3..1c423672 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -964,12 +964,12 @@
 
     <string name="only_nsfw">Only NSFW</string>
     <string name="only_spoiler">Only Spoiler</string>
-    <string name="title_excludes_strings_hint">Title: excludes keywords</string>
+    <string name="title_excludes_strings_hint">Title: excludes keywords (key1,key2)</string>
     <string name="title_excludes_regex_hint">Title: excludes regex</string>
-    <string name="exclude_subreddits_hint">Exclude subreddits</string>
-    <string name="exclude_users_hint">Exclude users</string>
-    <string name="exclude_flairs_hint">Exclude flairs</string>
-    <string name="contain_flairs_hint">Contain flairs</string>
+    <string name="exclude_subreddits_hint">Exclude subreddits (e.g. funny,AskReddit)</string>
+    <string name="exclude_users_hint">Exclude users (e.g. Hostilenemy,random)</string>
+    <string name="exclude_flairs_hint">Exclude flairs (e.g. flair1,flair2)</string>
+    <string name="contain_flairs_hint">Contain flairs (e.g. flair1,flair2)</string>
     <string name="min_vote_hint">Min vote (-1: no restriction)</string>
     <string name="max_vote_hint">Max vote (-1: no restriction)</string>
     <string name="min_comments_hint">Min comments (-1: no restriction)</string>