How to replace words in PDF using Acrobat SDK in C#?

Hi,

I have some PDFs that contain sensitive information in form of text, like name of person, city, etc. These PDFs need to be duplicated into another copy but while creating duplicated copy, sensitive text needs to be searched & replaced with some dummy text. The replacement is essential to avoid tracing original information, by any fraudulent means. Also, the replaced text requires to be redacted.

Finding text is expected to support RegEx, as there could be variations of text that needs to be masked.

Could you please assist me how can this be done using Acrobat SDK in C#?

Thanks in advance.