The regular expression used in this filter isn't working correctly. It assumes that the id of a gist will only contain numeric characters, which is not the case (although it may have been in the past).
I've tweaked the regular expression to get it working again. I'll submit a patch shortly.
Needs review
1.0
Code
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
Thank you for this patch (used https://www.drupal.org/files/issues/regex_not_working-1957754-10.patch → ). I have used your patch with modifications in my port to Backdrop CMS 🌱 Port to Backdrop CMS Fixed .
You can see the Backdrop CMS version of this module at: