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That's a beginner mistake, it's really hard to make if you dealt even a bit with some regular expressions.

Probably not even a regex, just a straight replace. Hopefully at the render layer and not the backend data.

s/\btwitter\.com\b/x.com/ig

You made the same mistake with the same amount of confidence.

1. your version replaces at-twitter.com with at-x.com

2. your version replaces twitter.com.au with x.com.au

twitter.com.au deserves what they get. LoL

I probably would have pushed back against the replace in the first place.