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:overlap
Combined from primary sources listed below.

In Regexes§

See primary documentation in context for Overlap.

To get several matches, including overlapping matches, but only one (the longest) from each starting position, specify the :overlap (short :ov) adverb:

given 'abracadabra' {
    for m:overlap/ a .* a / -> $match {
        say ' ' x $match.from, ~$match;
    }
}

produces

    abracadabra
       acadabra
         adabra
           abra