Removes certain characters when generating URL.

op-util.el

@@ -180,7 +180,7 @@ so do `trim-string-left' and `trim-string-right'."
   "Encode STRING to legal URL. Why we do not use `url-encode-url' to encode the
 string, is that `url-encode-url' will convert all not allowed characters into
 encoded ones, like %3E, but we do NOT want this kind of url."
-  (downcase (replace-regexp-in-string "[ :/\\]+" "-" string)))
+  (downcase (replace-regexp-in-string "[ .,:;/\\]+" "-" (replace-regexp-in-string "[.!?'\"]" "" (replace-regexp-in-string "[.!?]+$" "" string)))))
 
 (defun get-full-url (uri)
   "Get the full url of URI, by joining `op/site-domain' with URI."