That doesn't work with strings internally encoded as UTF8 before 5.10.0 (and not at all before 5.8.0).

If you're working with arbitrary characters, if you don't to mess with utf8::downgrade, or if you are worried about backwards compatibility, you can use the following instead: 

@vals = $in =~ /(..)/sg;

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In reply to Re^2: Difficulties with split by ikegami
in thread Difficulties with split by transiency

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