Fix multiple email handling in the Inbox.

Put an email regex into WebGUI::Utility, and use it in Form/Email and Account/Inbox.

lib/WebGUI/Utility.pm

@@ -79,6 +79,19 @@ sub commify {
 }
 
 
+#-------------------------------------------------------------------
+
+=head2 emailRegex ( )
+
+Returns a regex object that can be used to validate email addresses.
+
+=cut
+
+sub emailRegex {
+	return qr/^([0-9a-zA-Z]+[-._+&])*\w+@([-0-9a-zA-Z]+[.])+[a-zA-Z]{2,7}$/;
+}
+
+
 #-------------------------------------------------------------------
 
 =head2 formatBytes ( integer )