What is the right thing???
I can only judge the implementation, which considers $1 ff to be global.
update
This demonstrates whats happening, $2 is always the next character or empty.
DB<322> ;m/ ^ .*? (?{say "<$_ $2>"}) (.) (?=(.|$)) (*FAIL)/x
<babab >
<babab a>
<babab b>
<babab a>
<babab b>
<babab >
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