Routes regular expression

[eluser]cinoob[/eluser]
I've managed to get it to work with

Code:

$route['events/(?!index)([A-Za-z+]+)/(\d+)'] = "events/details/$1";

Should be fine for just about everything I need but this will still match an event with a name beginning with index. Does anyone know how to exclude all instances of index including the beginning of the string?