1 files changed, 8 insertions, 0 deletions
diff --git a/lib/puppet/parser/functions/is_valid_mac_address.rb b/lib/puppet/parser/functions/is_valid_mac_address.rb
index 0b91d0d..a00d874 100644
--- a/lib/puppet/parser/functions/is_valid_mac_address.rb
+++ b/lib/puppet/parser/functions/is_valid_mac_address.rb
@@ -12,6 +12,14 @@ module Puppet::Parser::Functions
         "given #{arguments.size} for 1")
     end
 
+    mac = arguments[0]
+
+    if /^[a-fA-F0-9]{1,2}:[a-fA-F0-9]{1,2}:[a-fA-F0-9]{1,2}:[a-fA-F0-9]{1,2}:[a-fA-F0-9]{1,2}:[a-fA-F0-9]{1,2}$/.match(mac) then
+      return true
+    else
+      return false
+    end
+
   end
 end