diff --git a/server/Cargo.lock b/server/Cargo.lock
index ce4e175..36d2a90 100644
--- a/server/Cargo.lock
+++ b/server/Cargo.lock
@@ -1359,6 +1359,7 @@ dependencies = [
  "env_logger 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "failure 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "jsonwebtoken 5.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand 0.6.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "regex 1.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 1.0.88 (registry+https://github.com/rust-lang/crates.io-index)",
diff --git a/server/Cargo.toml b/server/Cargo.toml
index fd3d577..93bd6ac 100644
--- a/server/Cargo.toml
+++ b/server/Cargo.toml
@@ -24,4 +24,5 @@ rand = "0.6.5"
 strum = "0.14.0"
 strum_macros = "0.14.0"
 jsonwebtoken = "*"
-regex = "1"
+regex = "*"
+lazy_static = "*"
diff --git a/server/src/lib.rs b/server/src/lib.rs
index 9cdbd33..814363b 100644
--- a/server/src/lib.rs
+++ b/server/src/lib.rs
@@ -12,7 +12,7 @@ pub extern crate jsonwebtoken;
 pub extern crate bcrypt;
 pub extern crate regex;
 #[macro_use] pub extern crate strum_macros;
-
+#[macro_use] pub extern crate lazy_static;
 pub mod schema;
 pub mod apub;
 pub mod actions;
@@ -89,21 +89,42 @@ pub fn naive_now() -> NaiveDateTime {
 }
 
 pub fn is_email_regex(test: &str) -> bool {
-  let re = Regex::new(r"^[a-zA-Z0-9.!#$%&’*+/=?^_`{|}~-]+@[a-zA-Z0-9-]+(?:\.[a-zA-Z0-9-]+)*$").unwrap();
-  re.is_match(test)
+  EMAIL_REGEX.is_match(test)
+}
+
+pub fn remove_slurs(test: &str) -> String {
+  SLUR_REGEX.replace_all(test, "*removed*").to_string()
+}
+
+pub fn has_slurs(test: &str) -> bool {
+  SLUR_REGEX.is_match(test)
 }
 
 #[cfg(test)]
 mod tests {
-  use {Settings, is_email_regex};
+  use {Settings, is_email_regex, remove_slurs, has_slurs};
   #[test]
   fn test_api() {
     assert_eq!(Settings::get().api_endpoint(), "http://0.0.0.0/api/v1");
   }
 
-  #[test]
-  fn test_email() {
+  #[test] fn test_email() {
     assert!(is_email_regex("gush@gmail.com"));
     assert!(!is_email_regex("nada_neutho"));
   } 
+
+  #[test] fn test_slur_filter() {
+    let test = "coons test dindu ladyboy tranny. This is a bunch of other safe text.".to_string();
+    let slur_free = "No slurs here";
+    assert_eq!(remove_slurs(&test), "*removed* test *removed* *removed* *removed*. This is a bunch of other safe text.".to_string());
+    assert!(has_slurs(&test));
+    assert!(!has_slurs(slur_free));
+  } 
 }
+
+
+lazy_static! {
+  static ref EMAIL_REGEX: Regex = Regex::new(r"^[a-zA-Z0-9.!#$%&’*+/=?^_`{|}~-]+@[a-zA-Z0-9-]+(?:\.[a-zA-Z0-9-]+)*$").unwrap();
+  static ref SLUR_REGEX: Regex = Regex::new(r"(fag(g|got|tard)?|maricos?|cock\s?sucker(s|ing)?|\bnig(\b|g?(a|er)?s?)\b|dindu(s?)|mudslime?s?|kikes?|mongoloids?|towel\s*heads?|\bspi(c|k)s?\b|\bchinks?|niglets?|beaners?|\bnips?\b|\bcoons?\b|jungle\s*bunn(y|ies?)|jigg?aboo?s?|\bpakis?\b|rag\s*heads?|gooks?|cunts?|bitch(es|ing|y)?|puss(y|ies?)|twats?|feminazis?|whor(es?|ing)|\bslut(s|t?y)?|\btrann?(y|ies?)|ladyboy(s?))").unwrap();
+}
+
diff --git a/server/src/websocket_server/server.rs b/server/src/websocket_server/server.rs
index 92542d0..a946c9e 100644
--- a/server/src/websocket_server/server.rs
+++ b/server/src/websocket_server/server.rs
@@ -10,7 +10,7 @@ use serde_json::{Value};
 use bcrypt::{verify};
 use std::str::FromStr;
 
-use {Crud, Joinable, Likeable, Followable, establish_connection, naive_now, SortType};
+use {Crud, Joinable, Likeable, Followable, establish_connection, naive_now, SortType, has_slurs, remove_slurs};
 use actions::community::*;
 use actions::user::*;
 use actions::post::*;
@@ -541,6 +541,10 @@ impl Perform for Register {
       return self.error("Passwords do not match.");
     }
 
+    if has_slurs(&self.username) {
+      return self.error("No slurs");
+    }
+
     // Register the new user
     let user_form = UserForm {
       name: self.username.to_owned(),
@@ -587,6 +591,12 @@ impl Perform for CreateCommunity {
       }
     };
 
+    if has_slurs(&self.name) || 
+      has_slurs(&self.title) || 
+      (self.description.is_some() && has_slurs(&self.description.to_owned().unwrap())) {
+      return self.error("No slurs");
+    }
+
     let user_id = claims.id;
 
     // When you create a community, make sure the user becomes a moderator and a follower
@@ -716,6 +726,11 @@ impl Perform for CreatePost {
       }
     };
 
+    if has_slurs(&self.name) || 
+      (self.body.is_some() && has_slurs(&self.body.to_owned().unwrap())) {
+      return self.error("No slurs");
+    }
+
     let user_id = claims.id;
 
     let post_form = PostForm {
@@ -894,8 +909,10 @@ impl Perform for CreateComment {
 
     let user_id = claims.id;
 
+    let content_slurs_removed = remove_slurs(&self.content.to_owned());
+
     let comment_form = CommentForm {
-      content: self.content.to_owned(),
+      content: content_slurs_removed,
       parent_id: self.parent_id.to_owned(),
       post_id: self.post_id,
       creator_id: user_id,
@@ -976,8 +993,10 @@ impl Perform for EditComment {
       return self.error("Incorrect creator.");
     }
 
+    let content_slurs_removed = remove_slurs(&self.content.to_owned());
+
     let comment_form = CommentForm {
-      content: self.content.to_owned(),
+      content: content_slurs_removed,
       parent_id: self.parent_id,
       post_id: self.post_id,
       creator_id: user_id,
@@ -1197,6 +1216,11 @@ impl Perform for EditPost {
 
   fn perform(&self, chat: &mut ChatServer, addr: usize) -> String {
 
+    if has_slurs(&self.name) || 
+      (self.body.is_some() && has_slurs(&self.body.to_owned().unwrap())) {
+      return self.error("No slurs");
+    }
+
     let conn = establish_connection();
 
     let claims = match Claims::decode(&self.auth) {
@@ -1264,6 +1288,10 @@ impl Perform for EditCommunity {
 
   fn perform(&self, chat: &mut ChatServer, addr: usize) -> String {
 
+    if has_slurs(&self.name) || has_slurs(&self.title) {
+      return self.error("No slurs");
+    }
+
     let conn = establish_connection();
 
     let claims = match Claims::decode(&self.auth) {
diff --git a/ui/src/components/community-form.tsx b/ui/src/components/community-form.tsx
index b5b222c..056c29d 100644
--- a/ui/src/components/community-form.tsx
+++ b/ui/src/components/community-form.tsx
@@ -155,6 +155,7 @@ export class CommunityForm extends Component<CommunityFormProps, CommunityFormSt
     if (msg.error) {
       alert(msg.error);
       this.state.loading = false;
+      this.setState(this.state);
       return;
     } else if (op == UserOperation.ListCategories){
       let res: ListCategoriesResponse = msg;
diff --git a/ui/src/components/login.tsx b/ui/src/components/login.tsx
index 2443369..933b08b 100644
--- a/ui/src/components/login.tsx
+++ b/ui/src/components/login.tsx
@@ -97,7 +97,7 @@ export class Login extends Component<any, State> {
         <div class="form-group row">
           <label class="col-sm-2 col-form-label">Username</label>
           <div class="col-sm-10">
-            <input type="text" class="form-control" value={this.state.registerForm.username} onInput={linkEvent(this, this.handleRegisterUsernameChange)} required minLength={3} />
+            <input type="text" class="form-control" value={this.state.registerForm.username} onInput={linkEvent(this, this.handleRegisterUsernameChange)} required minLength={3} pattern="[a-zA-Z0-9_]+" />
           </div>
         </div>
         <div class="form-group row">
diff --git a/ui/src/components/post-form.tsx b/ui/src/components/post-form.tsx
index 9845a1b..03ace38 100644
--- a/ui/src/components/post-form.tsx
+++ b/ui/src/components/post-form.tsx
@@ -151,7 +151,9 @@ export class PostForm extends Component<PostFormProps, PostFormState> {
   parseMessage(msg: any) {
     let op: UserOperation = msgOp(msg);
     if (msg.error) {
+      alert(msg.error);
       this.state.loading = false;
+      this.setState(this.state);
       return;
     } else if (op == UserOperation.ListCommunities) {
       let res: ListCommunitiesResponse = msg;