diff --git a/Rakefile b/Rakefile
index 308670b..ee39853 100644
--- a/Rakefile
+++ b/Rakefile
@@ -1,4 +1,5 @@
 require "bundler/gem_tasks"
+require 'rspec/core/rake_task'
 
 RSpec::Core::RakeTask.new(:spec) do |t|
     t.pattern = 'tests/*_spec.rb'
diff --git a/src/pincode_validator.rb b/src/pincode_validator.rb
index 4aa3d73..52fe036 100644
--- a/src/pincode_validator.rb
+++ b/src/pincode_validator.rb
@@ -1,6 +1,23 @@
 require "pincode_validator/version"
 
 module PincodeValidator
+  VERSION = "1.0.3"
+  FILENAME='regex.txt'
+
   class Error < StandardError; end
-  # Your code goes here...
+
+  def self.root
+    File.dirname __dir__
+  end
+
+  @@regexes ||= IO.readlines(File.join root, FILENAME).map do |line|
+    Regexp.new("^#{line.strip[1...-1]}$")
+  end
+
+  def self.valid?(pincode)
+    @@regexes.each do |r|
+      return true if r.match? pincode
+    end
+    false
+  end
 end
diff --git a/src/pincode_validator/version.rb b/src/pincode_validator/version.rb
deleted file mode 100644
index 8246a87..0000000
--- a/src/pincode_validator/version.rb
+++ /dev/null
@@ -1,3 +0,0 @@
-module PincodeValidator
-  VERSION = "1.0.3"
-end
diff --git a/tests/validate_spec.rb b/tests/validate_spec.rb
index 0a59546..247eab7 100644
--- a/tests/validate_spec.rb
+++ b/tests/validate_spec.rb
@@ -6,4 +6,10 @@ describe PincodeValidator do
         expect(described_class::valid? pin).to eq(true)
     end
   end
+
+  it 'should validate incorrect pincodes' do
+    ['999999', '99999', '9999', '999', '99', '9', '111111', '2447131'].each do |pin|
+        expect(described_class::valid? pin).to eq(false), "#{pin} should be invalid"
+    end
+  end
 end