Note that using + instead * is not equivalent. 

$ perl -e'$_ = "Hello"; print "<$1>\n" while /(?=(.*))/g;'
<Hello>
<ello>
<llo>
<lo>
<o>
<>

$ perl -e'$_ = "Hello"; print "<$1>\n" while /(?=(.+))/g;'
<Hello>
<ello>
<llo>
<lo>
<o>

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In reply to Re^2: Regex bug in 5.10 (was: Using Look-ahead and Look-behind) by ikegami
in thread Using Look-ahead and Look-behind by Roy Johnson

Title:
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