Obviously not a universal solution, but may be insertion of a (?{ code }) block could be helpful:

$_ = 'I am sample';
while (m/(?<be>am)(?{say pos})/ig) {
say $+{be};
}

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In reply to Re: Finding match offsets of named captures in 5.10 regex by Anonymous Monk
in thread Finding match offsets of named captures in 5.10 regex by nobull

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