freeCodeCamp/guide/english/certifications/javascript-algorithms-and-data-structures/regular-expressions/specify-exact-number-of-matches/index.md

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title: Specify Exact Number of Matches
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# Specify Exact Number of Matches


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## Hints

### Hint 1
We see that the answer is simply finding 4 m's in a row. The first anwser would be to match EXACTLY 4 times the character so we shall implement as following:
```javascript
let timRegex = /m{4}/;
```
This solution is incorrect because you wont pass the final test case ("Timber" with 30 m's in it) as there are multiple times mmmm in a row of 30 m.
You should try to get **no more than** ***(4 times m) mmmm***. 

### Hint 2
Based on the above I will try to specify exactly the characters before and after 4 times m!
***Remember:***  e.g. /b/ is a string literal for the word b so what if before and after mmmm we add ALL missing letters?


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## Solutions

<details><summary>Solution 1 (Click to Show/Hide)</summary>

From hint 1 we defined how to find mmmm in the timStr. From hint 2 we observe that we need to find the word Timmmmber=Tim{4}ber.
We simpply add the exact word in our timRegex value and the final result is:

```javascript
let timStr = "Timmmmber";
let timRegex = /Tim{4}ber/; // Change this line
let result = timRegex.test(timStr);
```
</details>