Essential Books

Match into groups

suggest change 
public string Check()
{
    string input = "Hello World!";
    string pattern = @"H.ll. (?<Subject>W.rld)!";

    Match match = Regex.Match(input, pattern);

    // World
    return match.Groups["Subject"].Value;
}
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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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