Is there an alternative to string.Replace that is case-insensitive?

Question

I need to search a string and replace all occurrences of `%FirstName%` and `%PolicyAmount%` with a value pulled from a database. The problem is the capitalization of FirstName varies. That prevents me from using the `String.Replace()` method. I've seen web pages on the subject that suggest ``` Regex.Replace(strInput, strToken, strReplaceWith, RegexOptions.IgnoreCase); ``` However for some reason when I try and replace `%PolicyAmount%` with `$0`, the replacement never takes place. I assume that it has something to do with the dollar sign being a reserved character in regex. Is there another method I can use that doesn't involve sanitizing the input to deal with regex special characters?

Accepted Answer

From MSDN $0 - "Substitutes the last substring matched by group number number (decimal)."

In .NET Regular expressions group 0 is always the entire match. For a literal $ you need to

```
string value = Regex.Replace("%PolicyAmount%", "%PolicyAmount%", @"$$0", RegexOptions.IgnoreCase);
```

Is there an alternative to string.Replace that is case-insensitive?

Solution

Problem