I posted the wrong pattern. I'm matching about 1000 files and get this sequence of errors 8 times. It looks like something, but what? I can't tell if it means 8 files have 1 error or 1 file has 8 errors. I suspect it may be 8 files, and might involve the Japanese language: 

UTF-16 surrogate U+DFA8
non-Unicode code point 0x1C9140
non-Unicode code point 0xE6BAAA
code point 0xFFFFFFFFFFFFFFFF
code point 0xFFFFFFFFFFFFFFFF
non-Unicode code point 0xFFFFFFFFFFFFFFFF
non-Unicode code point 0x18B0E4
non-Unicode code point 0x18B4DC
non-Unicode code point 0x18B0E4
Thank you for suggesting diagnostics. It shows something slightly different: a \t in front of every code point, like \tU+DFA8. I tried s/\t/ /gs before the regex but it has no effect.

Sorry I can't really post the code or data because it's too complicated :-/

In reply to Re^2: Fatal code point 0xFFFFFFFFFFFFFFFF by Anonymous Monk
in thread Fatal code point 0xFFFFFFFFFFFFFFFF by Anonymous Monk

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