All bash variables that can be used as temp variables?

[Peng Yu]

Hi,

https://lists.gnu.org/archive/html/help-bash/2023-01/msg00104.html

As discussed here BASH_REMATCH is a temp variable that can be used to
avoid polluting the global variable space. What other bash variables
can be used as temp variables (not necessarily for the purpose of
trimming prefixes and suffixes) to avoid polluting the global variable
space? Thanks.

-- 
Regards,
Peng