C# Replace string case insensitive [duplicate]

Question

I would like to replace "fWord" in the string "Input" as case insensitive.

while (FilteredWords.Any(Input.Contains))
{
    foreach (string fWord in FilteredWords)
    {
        Input = Input.Replace(fWord, "****");
    }
}

(FilteredWords is a list of strings and Input is the string to "clean") It works, however is case sensitive. How do I make fWord case insensitive at replacing?

Answer 1

If the answer from the duplicate question does't help you, here is the code in your case (notice I removed the while loop - the condition in it is false if casing is different and also you don't really need it):

foreach (string fWord in FilteredWords)
{
    Input = Regex.Replace(Input, fWord, "****", RegexOptions.IgnoreCase);
}

For example, the code below

string fWord = "abc";
input = "AbC";
input = Regex.Replace(input, fWord, "****", RegexOptions.IgnoreCase);

produces the value ****.