Re: “How about searching contents of PDF files?”
Are they Adobe files?
If so, you may need an Adobe subscription.
My Windows 10 can search all kinds of web pages and files.
But when my lawyer sends me an Adobe document, I need the Adobe subscription to “find” and “select” and “copy and paste.”
You're modifying the document, so you may very well need some PDF specific software. Nothing special is needed to scan the document for a specific character string.
They’re PDFs. When you say “Adobe files”, I have no idea what that means. There are a lot of different programs that can read and manipulate PDF files, it’s nothing unique to Adobe. In fact, Adobe Acrobat is horridly overpriced bloat-ware that is a total RAM-hog actually has less functionality than a lot of free and low-priced programs. I have no idea why my employer buys that crap.