local $_= "Stop tip stoop put up, tops steep 'creap' sleep soap!";
my @words;
push @words, $1
#   while  /(\b\w*(?!(.)\2)\w[aeiou]p\b)/g;
    while  /(\b(?:\w*(?!(.)\2)\w)?[aeiou]p\b)/g;
print "( @words )\n";
__END__
( Stop tip up creap soap )

[download]

Update: Changed . to \w so would not match, for example, "no-op" (if you want '-' allowed in words, then replace \w with, for example, [-\w] both places). Then: added (?:...)? to match two-letter words (since my original attempt that handled two-letter words fails because (?<!\2) is not smart enough to realize the fixed length of \2).

- tye        

In reply to Re: Another regex to solve ... (\2) by tye
in thread Another regex to solve ... by pat_mc

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