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perl -Mre=debug -e '@rr = "efgmnoxyz" =~ /(?=(\w\w\w))/g'

# perl -Mre=debug -e '@matches = "efgmnoxyz" =~ /(\w\w\w)/g' 2>&1 | gr
+ep 'Matching REx'
Matching REx "(\w\w\w)" against "efgmnoxyz"
Matching REx "(\w\w\w)" against "mnoxyz"
Matching REx "(\w\w\w)" against "xyz"

# perl -Mre=debug -e '@matches = "efgmnoxyz" =~ /(?=(\w\w\w))/g' 2>&1 
+| grep 'Matching REx'
Matching REx "(?=(\w\w\w))" against "efgmnoxyz"
...
Matching REx "(?=(\w\w\w))" against "noxyz"
Matching REx "(?=(\w\w\w))" against "oxyz"
Matching REx "(?=(\w\w\w))" against "xyz"