C# Replace string case insensitive

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?

you can use [regexp.replace](http://msdn.microsoft.com/ru-ru/library/xwewhkd1(v=vs.110).aspx) — Grundy, Mar 08 '14 at 07:16
no it's not a duplicate, because I already saw that method did not work to me (still was case sensitive).... — user3395421, Mar 08 '14 at 07:17
@user3395421 just stating "it didn't work" doesn't automatically make it not a duplicate. IT is recommended that you acknowledge the other question and explain **why** it didn't work. — psubsee2003, Mar 08 '14 at 09:45

Szymon · Accepted Answer · 2014-03-08T07:36:23.687

10

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 ****.

edited Mar 08 '14 at 07:36

answered Mar 08 '14 at 07:20

Szymon

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Still does not work properly... I input "abc" and I get "****" but if I input "AbC" I get "AbC" – user3395421 Mar 08 '14 at 07:23
What is `fWord` in this case? – Szymon Mar 08 '14 at 07:24
it's from a foreach, as you can see it's selected by a list of strings – user3395421 Mar 08 '14 at 07:25
What's the value of the variable? – Szymon Mar 08 '14 at 07:26
the list currently contains only the strings "abc" and "def" because I'm still testing it. – user3395421 Mar 08 '14 at 07:27
So check my example above. It's a simplified code that works fine for me. – Szymon Mar 08 '14 at 07:29
OK it worked but how do I select the words from a list of strings? Because if I do that it will not work (still don't know why). – user3395421 Mar 08 '14 at 07:35
Remove the `while` loop as it never gets executed. See the full code in the answer. – Szymon Mar 08 '14 at 07:37
nice ;) it worked. you saved my day! – user3395421 Mar 08 '14 at 07:39

C# Replace string case insensitive

1 Answers1