Using LINQ to parse the numbers from a string

Question

Is it possible to write a query where we get all those characters that could be parsed into int from any given string?

For example we have a string like: \"$%^DDFG

Answer 1

string testString = "$%^DDFG 6 7 23 1";
string cleaned = new string(testString.ToCharArray()
    .Where(c => char.IsNumber(c)).Take(3).ToArray());

If you want to use a white list (not always numbers):

char[] acceptedChars = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9' };
string cleaned = new string(testString.ToCharArray()
    .Where(c => acceptedChars.Contains(c)).Take(3).ToArray());