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Simple match and replace

suggest change 
public string Check()
{
    string input = "Hello World!";
    string pattern = @"W.rld";

    // Hello Stack Overflow!
    return Regex.Replace(input, pattern, "Stack Overflow");
}
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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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