freeCodeCamp/guide/english/certifications/javascript-algorithms-and-data-structures/regular-expressions/match-anything-with-wildcard-period/index.md

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title: Match Anything with Wildcard Period
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# Match Anything with Wildcard Period


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## Hints

### Hint 1
The dot `.` is the key in this challenge.

### Hint 2
You should put the dot on the right position.


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## Solutions

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

```javascript
let exampleStr = "Let's have fun with regular expressions!";
let unRegex = /.un/; // Change this line
let result = unRegex.test(exampleStr);
```
#### Code Explanation
The period `.` will be any one character so the strings "run", "sun", "fun" and "pun" have the same un charaters.
</details>