I ran across that misfeature with "#" because I could not pass :extended mode t to the parse-string function, which I use for debugging my regexps. So, I was forced to prepend "(?x)" to my regexps. I wonder if anyone else had a need for passing flags to parse-string:

(defun myre (inre &key (dbg nil)) (let ((re (concatenate 'string "(?ix)" inre))) (if dbg (cl-ppcre::parse-string re) (create-scanner re))))

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