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Re:Foldable Words by oh_sigh on Friday February 12, 2021 @12:57AM (#26111114)
Wouldn't the regex be the phrase interleaved with question marks: i?t?s?a?p?l?e? etc?

Using that on my /usr/share/dict/words, I get 634 matches, which is about in line with what the author got.

Re:Foldable Words by tgv on Friday February 12, 2021 @02:53AM (#26111538)
Apart from the ^...$, it's exactly that.