1 files changed, 27 insertions, 0 deletions
diff --git a/lib/puppet/parser/functions/is_mac_address.rb b/lib/puppet/parser/functions/is_mac_address.rb
new file mode 100644
index 0000000..1b3088a
--- /dev/null
+++ b/lib/puppet/parser/functions/is_mac_address.rb
@@ -0,0 +1,27 @@
+#
+# is_mac_address.rb
+#
+
+module Puppet::Parser::Functions
+  newfunction(:is_mac_address, :type => :rvalue, :doc => <<-EOS
+Returns true if the string passed to this function is a valid mac address.
+    EOS
+  ) do |arguments|
+
+    if (arguments.size != 1) then
+      raise(Puppet::ParseError, "is_mac_address(): Wrong number of arguments "+
+        "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
+
+# vim: set ts=2 sw=2 et :