@freemo @trinsec all I did was paste in my regex. Twitter was stupid enough to just display as-is, but Mastodon seems to have outsmarted itself. Is there something I should have done to tell Mastodon to leave it alone?

@worldsendless
Enclosing it in backticks as code: `^\([^ *].\{3,15\}\)\s-*$` should work. Or you could change the post content type to plaintext instead of markdown, but that would be the non-fun way to do it. 🙂