Esteemed monks ...

Here's an easy regex question for you ... or is it (I mean: 'easy')?

I want to detect all words ending in a vowel followed by the letter 'p'. So far so good. However, I only want the regex to match those words that do not have a double vowel. The regex should thus match 'step' and 'tip' but not 'stoop' or 'steep'. To me it looks like a combination of backreference and look-behind should do the trick ... just how, though, I can't get together. Can you please advise?

Thanks in advance and kind regards -

Pat

EDIT:
I tried something to the extent of /(?<!\1)([aeiou])p$/ but, of course, this did not work since the variable length look-behind is not available in the - admittedly very old - version of Perl that I'm using.

In reply to Another regex to solve ... by pat_mc

Title:
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