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Given the possibility of inadvertently shadowing symbols from imported packages using the syntax:

(defpackage :mypackage
  (:use :cl :ppcre :myregex))

It is considered a better practice to use the following syntax:

(defpackage :mypackage
  (:import-from :ppcre replace-regex))

To quote this thorough explanation (a recommended read):

USE is a bad idea in contemporary code except for internal packages that you fully control, where it is a decent idea until you forget that you mutate the symbol of some other package while making that brand new shiny DEFUN. USE is the reason why Alexandria cannot nowadays even add a new symbol to itself, because it might cause name collisions with other packages that already have a symbol with the same name from some external source.