I'm working on a couple of those projects and found a lot of conflicting and/or out of date information via Google.
Having finally worked out what the correct information should be, it made sense to post it in a few places where it is likely to be seen by others asking the same questions that I am...
Most of my RegEx stuff is usually to do with htaccess and mod_rewrite, and I'll hopefully post a few tips and answers about that over the next few months.
I had to contact one of the site owners or moderators to get my forum account activated. Until that time, all I had was a message something like 'This account needs to be approved before you can use it. We will send you an email once the account has been approved'. That took almost a week.