Org mode links: Open a PDF file at a given page and highlight a given string

[Rodrigo Morales]

I want to be able to

+ create a Org link to specific pages of a PDF. I've managed to
  accomplish this by setting the following value.

#+begin_src emacs-lisp :results silent
(setq org-file-apps
      '(("\\.pdf::\\([0-9]+\\)\\'" . "zathura -P %1 %s")))
#+end_src

The following links open the PDF at the given page.

[[file:~/Downloads/grub.pdf::10]]

[[file:~/Downloads/grub.pdf::20]]

[[file:~/Downloads/grub.pdf::30]]

+ create a Org link to specific pages of a PDF and highlight a given
  string.

#+begin_src emacs-lisp :results silent
(setq org-file-apps
      '(("\\.pdf::\\([0-9]+\\)::\\([^:]+\\)\\'" . "zathura -P %1 -f %2 %s")))
#+end_src

The following link must open the PDF at a given page and highlight the
given string. However, I'm getting the following error (see the
=#+begin_example= block below.)

[[file:~/Downloads/grub.pdf::95::do]]

#+begin_example
Debugger entered--Lisp error: (wrong-type-argument stringp nil)
  replace-match(nil t t "zathura -P 95 -f %2 /home/username/Downloads/grub....")
  org-open-file("~/Downloads/grub.pdf" nil nil "95::do")
  apply(org-open-file "~/Downloads/grub.pdf" nil (nil "95::do"))
  org-link-open((link (:type "file" :path "~/Downloads/grub.pdf" :format 
bracket :raw-link "file:~/Downloads/grub.pdf::95::do" :application nil 
:search-option "95::do" :begin 821 :end 858 :contents-begin nil :contents-end 
nil :post-blank 0 :parent (paragraph (:begin 821 :end 860 :contents-begin 821 
:contents-end 859 :post-blank 1 :post-affiliated 821 :parent nil)))) nil)
  org-open-at-point(nil)
  funcall-interactively(org-open-at-point nil)
  call-interactively(org-open-at-point nil nil)
  command-execute(org-open-at-point)
#+end_example

Note that the following accomplishes what I'm looking for

#+begin_src bash
zathura -P 95 -f do ~/Downloads/grub.pdf
#+end_src

My question is: How can I get rid of that error so that the PDF is
opened at a given page and the string is highlighted?

PS: If you want a PDF to test the link presented in this message, you
can download the following PDF (564K). It was the smallest PDF in
gnu.org I was able to find.

#+begin_src bash :dir ~/Downloads :results silent
wget 'https://www.gnu.org/software/grub/manual/grub/grub.pdf'
#+end_src

-- 
Greetings,
Rodrigo Morales.

IRC: rdrg109 (freenode)