The URI you submitted has disallowed characters: $1

[eluser]BrianDHall[/eluser]
Hm, then there is something going wrong elsewhere, it shouldn't do that.

First, ensure your rewrite rule is using double-quotes. If you use single quotes it will Not work.

Code:

// this should work
$route['([a-z_A-Z]+/[0-9]+.+)'] = "pensacola_coupons/test/$1";

// this may NOT work
$route['([a-z_A-Z]+/[0-9]+.+)'] = 'pensacola_coupons/test/$1';

If that isn't working then something is really wonky. What routes do you have before - is this the first route defined in routes.php?

For now you can also go to config.php and $config['permitted_uri_chars'] add the $ sign, (I can't remember if you need '$' or "\$', so try both).

If you are still having this it isn't a route problem, as it works on my system.

Without a debugger I can't say why, but perhaps try installing a fresh version of CI somewhere else and trying it there. If that doesn't work something is definately odd - perhaps check different version of $config['uri_protocol'] settings to double-check.