diff --git a/lib/washout_builder.rb b/lib/washout_builder.rb
index be7cba1..2a8ce1f 100644
--- a/lib/washout_builder.rb
+++ b/lib/washout_builder.rb
@@ -2,16 +2,19 @@
 require 'active_support/core_ext/object/blank'
 require 'active_support/core_ext/hash/keys'
 require 'active_support/concern'
-require 'active_support/core_ext/string/output_safety.rb'
+require 'active_support/core_ext/string/output_safety'
 require 'active_support/ordered_options'
+require 'active_support/core_ext/string/starts_ends_with'
 
 Gem.find_files('washout_builder/**/*.rb').each { |path| require path }
 
 
 ActionDispatch::Routing::Mapper.class_eval do
   alias_method :original_wash_out, :wash_out
-    # Adds the routes for a SOAP endpoint at +controller+.
-    def wash_out(controller_name, options={})
+  # Adds the routes for a SOAP endpoint at +controller+.
+  def wash_out(controller_name, options={})
+    env_checker = WashoutBuilder::EnvChecker.new(Rails.application)
+    if env_checker.available_for_env?(Rails.env)
       options = options.symbolize_keys if options.is_a?(Hash)
       if @scope
         scope_frame = @scope.respond_to?(:frame) ? @scope.frame : @scope
@@ -24,12 +27,12 @@ def wash_out(controller_name, options={})
       end
 
       match "#{controller_name}/soap_doc"   =>  WashoutBuilder::Engine, via: :get,
-        defaults: { name: "#{controller_class_name}" },
-        format: false,
-        as: "#{controller_class_name}_soap_doc"
-
-      original_wash_out(controller_name, options)
+      defaults: { name: "#{controller_class_name}" },
+      format: false,
+      as: "#{controller_class_name}_soap_doc"
     end
+    original_wash_out(controller_name, options)
+  end
 end
 # finds all the exception class and extends them by including the ExceptionModel module in order to be
 # able to generate documentation for exceptions
diff --git a/lib/washout_builder/engine.rb b/lib/washout_builder/engine.rb
index 90aaebc..229214d 100644
--- a/lib/washout_builder/engine.rb
+++ b/lib/washout_builder/engine.rb
@@ -1,19 +1,14 @@
+require_relative './env_checker'
 module WashoutBuilder
   # the engine that is used to mount inside the rails application
   class Engine < ::Rails::Engine
     isolate_namespace WashoutBuilder
     config.washout_builder = ActiveSupport::OrderedOptions.new
     initializer 'washout_builder.configuration' do |app|
-      blacklisted_envs = app.config.washout_builder[:blacklisted_envs]
-      blacklisted_envs = blacklisted_envs.is_a?(Array) ? blacklisted_envs : [blacklisted_envs].compact
-      whitelisted_envs = app.config.washout_builder[:whitelisted_envs]
-      whitelisted_envs = whitelisted_envs.is_a?(Array) ? whitelisted_envs : [whitelisted_envs].compact
       mounted_path = app.config.washout_builder[:mounted_path]
-      if (whitelisted_envs.present? || blacklisted_envs.present?) && whitelisted_envs.find{|a| blacklisted_envs.include?(a) }.blank?
-        if whitelisted_envs.include?('*') || (!blacklisted_envs.include?(Rails.env) || whitelisted_envs.include?(Rails.env))
-          app.routes.append do
-            mount WashoutBuilder::Engine => mounted_path if mounted_path.is_a?(String) && mounted_path.starts_with?('/')
-          end
+      if WashoutBuilder::EnvChecker.new(app).available_for_env?(Rails.env)
+        app.routes.append do
+          mount WashoutBuilder::Engine => mounted_path if mounted_path.is_a?(String) && mounted_path.starts_with?('/')
         end
       end
     end
diff --git a/lib/washout_builder/env_checker.rb b/lib/washout_builder/env_checker.rb
new file mode 100644
index 0000000..c16d57b
--- /dev/null
+++ b/lib/washout_builder/env_checker.rb
@@ -0,0 +1,50 @@
+module WashoutBuilder
+  class EnvChecker
+
+    attr_reader :whitelist, :blacklist
+    attr_writer :whitelist, :blacklist
+
+    def initialize(app)
+      self.whitelist = get_valid_data(app.config.washout_builder[:whitelisted_envs])
+      self.blacklist = get_valid_data(app.config.washout_builder[:blacklisted_envs])
+    end
+
+    def available_for_env?(env_name)
+      if (whitelist.present? || blacklist.present?)
+        if whitelist.find{|a| blacklist.include?(a) }.blank?
+          if whitelist.include?('*') || (!valid_for_env?(blacklist, env_name) && valid_for_env?(whitelist, env_name))
+            return true
+          end
+        end
+      else
+        return true
+      end
+      return false
+    end
+
+
+    private
+
+    def valid_for_env?(list, env_name)
+      try_find_suitable_env(list, env_name).present?
+    end
+
+    def get_valid_data(list)
+      list.is_a?(Array) ? list : [list].compact
+    end
+
+    def try_find_suitable_env(list, env_name)
+      return if list.blank?
+      # The keys of the map can be strings or regular expressions that are
+      # matched against the env name and returns the found value
+      list.find do |env_pattern|
+        if env_pattern.is_a? Regexp
+          env_pattern.match env_name
+        elsif env_pattern.is_a? String
+          env_pattern == env_name
+        end
+      end
+    end
+
+  end
+end
diff --git a/lib/washout_builder/version.rb b/lib/washout_builder/version.rb
index 252502c..cb8ee8b 100644
--- a/lib/washout_builder/version.rb
+++ b/lib/washout_builder/version.rb
@@ -12,7 +12,7 @@ module VERSION
     # the minor version of the gem
     MINOR = 5
     # the tiny version of the gem
-    TINY = 0
+    TINY = 1
     # if the version should be a e
     PRE = nil