image-file-name-regexp: Wrong type argument: characterp

image-file-name-regexp: Wrong type argument: characterp

[Janek F]

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Hello,

I wanted to mark certain filenames as images and added this to my config.el:

(add-to-list 'image-file-name-regexps "/preview/")

But when I run `org-toggle-inline-images` now, I get the following error.

image-file-name-regexp: Wrong type argument: characterp, "/preview/"

Even though it says:
```lisp
image-file-name-regexps is a variable defined in image-file.el.gz.

Value
("/preview/")

Documentation
List of regexps matching image-file filenames.
```And the variable is clearly a list.

As posted in [https://emacs.stackexchange.com/questions/72902/image-file-name-regexp-wrong-type-argument-characterp](https://emacs.stackexchange.com/questions/72902/image-file-name-regexp-wrong-type-argument-characterp?noredirect=1#comment118105_72902)

Best,
Janek

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Re: image-file-name-regexp: Wrong type argument: characterp

[Ihor Radchenko]

Janek F <xerusx@pm.me> writes:

> I wanted to mark certain filenames as images and added this to my config.el:
>
> (add-to-list 'image-file-name-regexps "/preview/")
>
> But when I run `org-toggle-inline-images` now, I get the following error.
>
> image-file-name-regexp: Wrong type argument: characterp, "/preview/"

This is likely because you are using the bleeding edge Emacs.
Please update your Emacs to fix the issue, which is on Emacs side.
See https://lists.gnu.org/archive/html/emacs-devel/2022-08/msg00004.html

Best,
Ihor

Re: image-file-name-regexp: Wrong type argument: characterp

[Ihor Radchenko]

Adding back Org ML to the CC.

Janek F <xerusx@pm.me> writes:

> Actually, I am running 28.1 from the Arch Repos, with Doom Emacs.
> Does that still apply?
>
> Thanks for the pointer anyways.

It does not, indeed.

> I wanted to mark certain filenames as images and added this to my config.el:
> (add-to-list 'image-file-name-regexps "/preview/")
>
> But when I run `org-toggle-inline-images` now, I get the following error.
>
> image-file-name-regexp: Wrong type argument: characterp, "/preview/"

I looked further and I am able to reproduce.

However, it has nothing to do with Org. It is a bug in Emacs. In
image-file-name-regexp function. image-file-name-regexp assumes that
image-file-regexps variable is a string.

Please, report this bug to Emacs developers via M-x report-emacs-bug

Best,
Ihor