Remove a list of characters from string in C#

Question

I need a method that removes a list of characters from a string. I need to support properly all characters but I'm not sure I'm managing surrogate characters properly.

Is there any better way?

public static string Remove(string source, char[] oldChar)
{
    if (string.IsNullOrEmpty(source) || oldChar == null || oldChar.Length == 0)
        return source;

    for (int i = source.IndexOfAny(oldChar, 0); i != -1; i = source.IndexOfAny(oldChar, i))
        source = source.Remove(i, char.IsSurrogatePair(source, i) ? 2 : 1);

    return source;
}

Thank you

Frank

Well how do you want to support surrogate pairs? Because you can't represent a non-BMP character in a single char value anyway... perhaps your second argument should be int[]? — Jon Skeet
– Jon Skeet, Commented Jul 18, 2013 at 18:34

dav_i · Accepted Answer · 2013-07-18 21:52:07Z

3

The following does not deal with surrogate pairs as it is not clear from the question what you want to do. If fulfils the requirement of removing a list of characters from a string

public static string Remove(string source, char[] oldChar)
{
    return String.Join("", source.ToCharArray().Where(a => !oldChar.Contains(a)).ToArray());
}

Example:

var s = "hello world";
var c = new[] { 'l', 'o' };
Remove(s, c); //returns: he wrd

edited Jul 18, 2013 at 21:52

answered Jul 18, 2013 at 20:54

dav_i

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dav_i · Accepted Answer · 2013-07-18 21:52:24Z

0

If your goal is to remove surrogates may I suggest the following method: Char.ConvertFromUtf32(int utf32);

answered Jul 18, 2013 at 21:52

dav_i

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