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:exhaustive
Combined from primary sources listed below.

In Regexes§

See primary documentation in context for Exhaustive

To find all possible matches of a regex – including overlapping ones – and several ones that start at the same position, use the :exhaustive (short :ex) adverb.

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

The above code produces this output:

    abracadabra
    abracada
    abraca
    abra
       acadabra
       acada
       aca
         adabra
         ada
           abra