I just moved my website from a server running Apache 2.0 to Apache 2.2. I have a rewrite in my .htaccess which was working prior to the move, but now it doesn't work. Here is the rewrite.

RewriteRule ^\/([A-Za-z]+)\/([A-Za-z0-9]+)\.html$ process\.php?class=$1&action=$2

It doesn't appear to be a problem with the configuration of the server because this rewrite works as expect.

RewriteRule ^test\.html$ test\.php

If anyone has any ideas to share about what might the cause, that would be appreciated. Thanks for reading this.

You don't need to include the starting "/" in your rule, so change it to:
and see if it works.

Sorry, the leading slash actually wasn't there. I accidentally pasted one of my other attempts to get it to work. Is there something wrong with the regex? I was told that Apache 2.2 is much more strict in terms of what it will accept for rewrites compared to 2.0

I don't think apache 2.2 is more strict regarding regexes. In fact I've tested your rule with a php file that accepts 2 arguments and it works.
So what is the problem you face? You can take a look at rewrite_log and error_log to see what happens.

So I've tried emailing my server admin about getting access to those logs, but they haven't responded so I think I'm on my own for this. One thing I noticed is that if I replace the / with a - in the rewrite condition (and make the corresponding change in the calling url), it works. Do you have an idea of why this is occurring?

How should I know, if you don't post the RewriteCond?

It's the same as your first post, just with the / replaced with -.