How to program a text search and replace in PDF files

Question

How would I be able to programmatically search and replace some text in a large number of PDF files? I would like to remove a URL that has been added to a set of files. I

Answer 1

I just finished trying out infix for a text that is comprised of text ladened with diacritics with the hope of generating another text where characters with double and composed diacritics are replaced by alternate with single diacritics. Infix is such definitely a good solution for someone who does not care for the trouble of understanding the working of programmatic solutions. All the request changes were effected. Still need to understand how to effect reflow of words that change the layout of text.