Well; I did it!
How, you may ask? Isn’t the appybuilder community offline?
Well, I used https://archive.org to go to the appybuilder community website when it was crawled last time (somewhere in 2018)
Luckily, it also backups files; here it is: com.appybuilder.TextUtils.aix (9.1 KB)
And it works!
If it isn’t allowed to re-upload extensions, I’ll delete it from my post, but if it isn’t, there ya go, the TextUtils extension!