This simple perl script hangs in 5.6.1 and 5.8 (in 5.8, without the "use utf8" line).

printf "x\0227 " | perl -e 'use utf8; while (<STDIN>) { s/\d //; }'

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Has anyone run into this? Know a work-around? Seen a bug fix?

Note that I realize the input ('x\0227 ') is malformed, but shouldn't perl report "Malformed UTF-8" rather than just hanging?

Note also that there seems to be a rather specific case where this happens--the pattern must be a character class followed by a space. For example, s/[a] //; also hangs. The input must also have a trailing space.

In reply to pattern match hangs on malformed UTF-8 input by y9o

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