It’s very unfortunate, but it seems that the bash-hackers.org domain (a dokuwiki for bash scripting) wasn’t renewed or something like that because now there’s a squatter. I know this might be futile, but does anyone have the text (since dokuwiki allows for raw text in their own markup language) or a backup of some sort? It potentially could be hosted on git{hub,lab}. I used it as a nice reference for some of the extended tests and parameter expansion (I periodically can’t seem to remember all of them).

https://wiki.bash-hackers.org/syntax/pe