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Remove non alphanumeric characters from string

suggest change 
public string Remove()
{
    string input = "Hello./!";
    
    return Regex.Replace(input, "[^a-zA-Z0-9]", "");
}
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Regular expressions:
* Regular Expressions System.Text.RegularExpressions
* Check if pattern matches input
* Passing Options
* Match into groups
* Remove non alphanumeric characters from string
* Simple match and replace
* Find all matches
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