Question to get the date out of a document

So I have pdf files and each of these pdf files (articles) have a date at the top of the page. not at the very top. but around there. The date format is like 19 April 2012. I want to get the first date that shows up and set it as an attribute called "Mydate", is that even possible in rapidminer and how would I go about doing that? thank you.