**Problem Statement:**

I'm trying to build a regular expression which accepts two consecutive special characters like: `/_` or `\\` or `./` or `--` or `\-` or any other combination of special charcters (`./\_-`),in the regular expression mentioned below:

```
^[a-zA-Z0-9\d]{1}[a-zA-Z0-9\d._/\-]{0,49}$

```

What i'm doing wrong here?