apacman doesn't support packages with '@' or '+'

[lectrode]

Original issue reported here

Current supported package attributes/definitions:
https://wiki.archlinux.org/index.php/PKGBUILD#Package_name

When regex mode was implemented, it was made with the assumption that packages did not have these symbols (to be fair, it looks like there is only one package that uses '@', and it is in the official Arch repos). The suggested (accepted?) resolution in the original issue thread is to remove the regex mode entirely.

However, I believe the solution does not have to be that drastic. Instead of supporting Extended Regex, it can be simplified to Basic Regex (see differences here). This would resolve the issue of current unsupported characters, as well as retain the functionality from the original wildcard request.

This seems like another relatively simple change, especially if I introduce static variables to easily define the "valid" characters in the PKGBUILD variables throughout the script.