How Can I Efficiently Remove Specific or Non-Alphanumeric Characters from a C# String?

How to remove unnecessary characters from C# strings

In various programming scenarios, you may need to remove specific characters from a string. Consider the following example:

Suppose you have a string: "My name @is ,Wan.;';Wan". You want to remove the characters "@", ",", ".", ";" and "'" from the string to get "My name is Wan Wan".

Method 1: Iterative deletion

One way is to iterate through each character in the string and use the Replace method to remove the specified character. Here's how you can do it:

var str = "My name @is ,Wan.;'; Wan";
var charsToRemove = new string[] { "@", ",", ".", ";", "'" };
foreach (var c in charsToRemove)
{
    str = str.Replace(c, string.Empty);
}

Method 2: Deletion based on regular expressions

Alternatively, you can use regular expressions to remove all non-alphabetic characters. Here's a more comprehensive method that will remove any characters that are not spaces, letters, or numbers:

var str = "My name @is ,Wan.;'; Wan";
str = new string((from c in str
                  where char.IsWhiteSpace(c) || char.IsLetterOrDigit(c)
                  select c
       ).ToArray());

This will get the result "My name is Wan Wan".

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