<p>How can I replace multiple spaces in a string with only one space in C#?</p>

<p>Example:</p>

<pre><code>1 2 3  4    5
</code></pre>

<p>would be:</p>

<pre><code>1 2 3 4 5
</code></pre>

```
```
string sentence = "This is a sentence with multiple    spaces";
RegexOptions options = RegexOptions.None;
Regex regex = new Regex("[ ]{2,}", options);     
sentence = regex.Replace(sentence, " ");
```
```