The code I’m using is this:

```
let userCheck = /^[a-z][a-z]+\d*$/i;
```

This solves the problem. The given solution is however of the form

```
let userCheck = /^[a-z]{2,}\d*$/i ;
```

which is a form I’m not familiar with. A little research shows that this is a quantifier which has not been introduced yet, and is further down the challenge list. Shouldn’t the official solutions only use the concepts that have been introduced upto that point in the challenges? Because when I looked at it for help in solving I found myself a little confused. And I am sure a few others were as well.