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It's not worth having such a trivial wrapper for read-regexp.

* lisp/dired.el (dired-read-regexp): Make obsolete.
(dired-mark-files-regexp, dired-mark-files-containing-regexp)
(dired-flag-files-regexp):
* lisp/dired-aux.el (dired-mark-read-regexp):
* lisp/dired-x.el (dired-mark-unmarked-files): Use read-regexp directly.