[WebODF] Find and replace

Hi all, has anyone tried to find and replace a string in webodf? After opening the document I need to find a specific string and replace it with a large amount of text. User fields (defined in the document) is not an option as it ignores carriage returns. A possibility would be to position the cursor (and select) the string I am searching for and the paste my data (maybe with PasteController) but I can't find anything that positions the cursor on the text I'm looking for. Can anybody help? Thanks so much, Helder Gramacho Portugal