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Have you considered reading the xref table before beginning your manipulations, using it to calculate the sizes of the objects, reading the objects as binary records (set $/ to a reference to a number or use read) using the xref information, and then simply calculating and writing a new xref table? That should be faster still than asking the regex engine to scan the entire contents of a PDF.

therefor my regex forces this byte sequence to be found at the beginning of a line

A binary stream can also contain an end-of-line sequence, especially if we consider maliciously crafted input.


In reply to Re^3: Calculated position incorrect when using regex in text file that also contains binary info by jcb
in thread Calculated position incorrect when using regex in text file that also contains binary info by geertvc

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