New Post: Adding regular expression validator to a Razor Function property?

Not my area of expertise but I have only seen it used in this context:

        #region Data field attributes
        [ImmutableFieldId("c68429ed-74c3-4ad6-afee-b6364f80f224")]
        [StoreFieldType(PhysicalStoreFieldType.String, 64)]
        [LazyFunctionProviedProperty("<f:function xmlns:f=\"http://www.composite.net/ns/function/1.0\" name=\"Composite.Ut" +
            "ils.Validation.RegularExpressionValidation\">\r\n  <f:param name=\"pattern\" value=\"{put in your validation regex here}" +
            "\" />\r\n</f:function>")]
        [NotNullValidator()]
        [FieldPosition(0)]
        [StringSizeValidator(0, 64)]
        [DefaultFieldStringValue("")]
        #endregion
        string Title { get; set; }

I assume thats the intention of the RegularExpressionValidation function you found, and it properly takes some work to get what you trying to work.