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Working with Regular Expressions in C#

Using Regular Expressions in C# with Groups

Learn how to use groups with regular expressions.

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Groups

Groups are a way of subdividing the match that regular expressions find. We specify groups with parentheses in regular expressions.

For example, we have the following input string:

The quick brown fox jumps over the lazy dog.

To match all the words in this string, we use the following regular expression:

C#
using System.Text.RegularExpressions;
class HelloWorld
{
    static void Main()
    {
      string text = "The quick brown fox jumped over the lazy dog.";
      Match match = Regex.Match(text, "\\w+");
      System.Console.WriteLine(match.Groups[0]);
    }
}

The regular expression \w+ matches the first word The. However, what if we want to match only the first three words? We can use a group for this:

(\w+) (\w+) (\w+)

This regular expression matches “The quick brown.”

Accessing group

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