But "x\227 " isn't utf8. I changed your snippet to printf "x\0227 " | perl -MDevel::Peek -e 'while (<STDIN>) { Dump($_) }' (with and without utf8 AS 5.6.1/cygwin 5.8.0) and in no case is your input treated like utf8. Can you write a plain-perl version?

In reply to Re: pattern match hangs on malformed UTF-8 input by diotalevi
in thread pattern match hangs on malformed UTF-8 input by y9o

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