The following regex is failing on me;

```
[Aa][æ-åÆ-Å].*

```

But this regex is not failing

```
[Aa][v-zV-Z].*

```

It is only when æ-å is used (danish carachters). Im puzzled why?

The error i am getting it

```
parsing "[Aa][æ-åÆ-Å].*" - [x-y] range in reverse order.

```