User: username regex is a const now

app/models/user.rb

@@ -95,10 +95,8 @@ class User < ActiveRecord::Base
     end
   end
 
-  def self.username_regex
-    User.validators_on(:username).select{|v|
-      v.class == ActiveModel::Validations::FormatValidator }.first.
-      options[:with].inspect
+  def self.username_regex_s
+    "/^" + VALID_USERNAME.to_s.gsub(/(\?-mix:|\(|\))/, "") + "$/"
   end
 
   def as_json(options = {})

app/views/settings/index.html.erb

@@ -14,7 +14,7 @@
       <%= f.label :username, t('.username'), :class => "required" %>
       <%= f.text_field :username, :size => 15 %>
       <span class="hint">
-        <tt><%= User.username_regex %></tt>
+        <tt><%= User.username_regex_s %></tt>
       </span>
     </div>
 

app/views/signup/invited.html.erb

@@ -27,7 +27,7 @@
     <%= f.label :username, "Username:", :class => "required" %>
     <%= f.text_field :username, :size => 30 %>
     <span class="hint">
-      <tt><%= User.username_regex %></tt>
+      <tt><%= User.username_regex_s %></tt>
     </span>
     <br />