'slime-unintern-symbol' if package name designator is not a symbol

[mr1yh1]

if buffer has
(in-package :test)
slime is trying to unintern a symbol from package ':test' instead of 'test'.
so
(in-package 'test) ; is OK
(in-package :test) ; is NOT OK
(in-package #:test) ; is NOT OK

'slime-search-buffer-package' function in slime.el ;
regex for current buffers package name is;
(concat "^((cl:|common-lisp:)?in-package>[ \t']" "([^)]+)[ \t])"))

adding '#' and ':' to the regex seems solved problem for me
(concat "^((cl:|common-lisp:)?in-package>[ \t':#]" "([^)]+)[ \t])"))