For 
perl -e 'use re "debug"; "01234" =~ /^(.+)(.+)((?:.z?)+)$(?{ print "$1
+ $2 $3\n" })(*FAIL)/' 2>&1 | less

[download]
for the missing "0 1 234" the trace has 
whilem: (cache) already tried at this position...
failed...

[download]
and my wild guess is that it cached the effect of (*FAIL) and not the real failure of a regexp, hence EVAL is skipped and last result is missed. I didn't find the way to disable the cache with "use re".

In reply to Re^2: Bug with finding all regexp matches by Anonymous Monk
in thread Bug with finding all regexp matches by Anonymous Monk

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