Regex to find percent sign with actual math value

Question

I have a string like `30+20%`. Now I want to replace `20%` with `(20/100)`. Thats it.

Accepted Answer

If the percent doesn't occur in any other situation in the string, you don't even need a regular expression:

```
s = s.Replace("%", "/100");
```

To add the parentheses you need the regular expression though:

```
s = Regex.Replace(s, @"(\d{1,3})%", "($1/100)");
```

Solution