Set up exclusion by code?

pfff…sorry still some test code…
Now I tested it exactly the way you want to implement it. And this works on my local WP installation:

function external_link_filter($created_link, $original_link, $label, $attrs = array()) {
	if (isset($attrs['class']) && strpos($attrs['class'], 'gajnfads') !== false) {
		return $original_link;
	}

	return $created_link;
}
add_filter('wpel_external_link', 'external_link_filter', 10, 4);

Absolutely BRILLIANT!
A few tweaks to the OIO-Publisher plugin and now your plugin’s enhancement has the links working perfectly.

Thank you so much for a brilliant plugin! Rated 5 Stars

Thanks Martin!

This is the second support topic I’ve posted in for WP External Links, and the second time I’ve been really impressed by @freelancephp responses! ??

I’ll post my problem/solution here just in case it saves someone else the 2hrs I’ve spent on this today.

My problem:
==========
WP External Links produces strange mangled output of <a> tags that contain custom HTML5 attributes.

For example:

<a href="https://example.com" data-referer="something.com">External Link</a>

will get output as:

<a class="ext-link ext-icon-6" href="https://example.com" rel="external nofollow" 0="data-referer="something.com"">External Link</a>

I’m guessing this is because when the regex rebuilds the <a> tag, it doesn’t recognize the data-* attributes, so creates an array of them.. hence the extra 0=… 1=…. 2=…. etc.

My solution:
=============
Using the new & excellent wpel_external_link() filter hook, it’s easy to exclude this links from being processed.

However it would be perfect if the rebuilding function could account for these custom attributes and preserve them… but I don’t know the level-of-effort required for this. ??

I have tried that code with class name “sfx” for https://www.peleke.de/galerie/flickr/?page_id=0&albid=72157633109872572 but that doesn’t seem to work.
Can you please take a look why?
Thanks!

Hello!
I tried to use the hook to exclude a class “not-external” and place this code into functions.php

function external_link_filter($created_link, $original_link, $label, $attrs = array()) {
	if (isset($attrs['class']) && strpos($attrs['class'], 'not-external') !== false) {
		return $original_link;
	}
	return $created_link;
}
add_filter('wpel_external_link', 'external_link_filter', 10, 4);

my link is a kind of
<a href="https://fc00.deviantart.net/fs70/i/2013/220/4/2/horo_by_mrshlapa-d6h90v5.png" class="not-external"> 12313213</a>

But is doesn’t seem to work. I don’t know what’s wrong. Please, any help