OT: regular expression question

[Peter Jay Salzman]

i know how to search for palindromes, for instance, a 3 letter palindrome:

        \(.\)\(.\)\(.\)\3\2\1

recently, i started wondering if there was a way, using regex only, to
express a palindrome of arbitrary letter length?

i've used some grey matter, and the answer seems to be no, but there's nice
symmetry here.  maybe i'm missing something...

pete

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