**Tell us what’s happening:**

**I am going crazy in this challenge!!**

**I tried this code:

let timStr = “Timmmmber”;

let timRegex = /ti{4}ber/; // Change this line

let result = timRegex.test(timStr); but it did’nt work

**Your code so far**

```
let timStr = "Timmmmber";
let timRegex = /[^m]m{4}{?!m}/; // Change this line
let result = timRegex.test(timStr);
```

**Your browser information:**

User Agent is: `Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/67.0.3396.99 Safari/537.36`

.

**Link to the challenge:**

https://learn.freecodecamp.org/javascript-algorithms-and-data-structures/regular-expressions/specify-exact-number-of-matches