[cl-ppcre-devel] empty line matches with cl-ppcre

I'm confused. I must be doing something wrong. I have a string: CL-USER> *str* "1 2 3 4 " Just to make sure it's really what it seems: CL-USER> (loop for c across *str* do (format t "~S " c)) #\1 #\Newline #\2 #\Newline #\3 #\Newline #\Newline #\4 #\Newline NIL I wanted to match empty lines, so I did: CL-USER> (cl-ppcre:regex-replace-all (cl-ppcre:create-scanner "^$" :multi-line-mode t) *str* "!") "1 2 3 !! 4 !!" Now, I would normally expect this: "1 2 3 ! 4 " Playing with regex-coach indeed produces the result I'd normally expect. What am I doing wrong? (using CMUCL 19a, the testing version, and CL-PPCRE-0.7.7) many thanks, --J.