I want to change some Text-Coloring by regex search in one or more PDFs. for example i want to change the color of all appearances of "A[0-9]+.[0-9]" like A120.1, A600.0 and so on. is it even possible to change specific text colors in a PDF. a command line solution would be nice, I don't care if win or linux - both would be ok Thank you in advance for suggestions.

edit: maybe this could also be made with javascript inside the PDF, but I still couldn't manage to change the text color. Only highlighting or underlining worked. (tried in PDF Xchange)

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