Ted Nyberg posted about parsing dynamic content from code, rather than from a property. This might be what you're looking for:
I just posted this, related to this discussion:
Simple Token Replacement
Based on what you're doing, this might be a good fit.
I have a page type based on the Long String > 255, that has a DynamicContent property to display a site wide value on the web page. The value is displayed when the following is used on the ASPX page
Is there a way of getting the value of the DynamicContent property in the code behind, as we use the first 100 characters of this field as the teaser text on the listing (branch) page. I can get the value with