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==Illustrates the use of groups and captures==

<source lang="csharp">
/*
Mastering Visual C# .NET
by Jason Price, Mike Gunderloy
Publisher: Sybex;
ISBN: 0782129110
*/
/*
ExampleC_2.cs illustrates the use of groups and captures
*/
using System;
using System.Text.RegularExpressions;
public class ExampleC_2
{
public static void Main()
{
// create a string containing area codes and phone numbers
string text =
"(800) 555-1211\n" +
"(212) 555-1212\n" +
"(506) 555-1213\n" +
"(650) 555-1214\n" +
"(888) 555-1215\n";
// create a string containing a regular expression to
// match an area code; this is a group of three numbers within
// parentheses, e.g. (800)
// this group is named "areaCodeGroup"
string areaCodeRegExp = @"(?<areaCodeGroup>\(\d\d\d\))";
// create a string containing a regular expression to
// match a phone number; this is a group of seven numbers
// with a hyphen after the first three numbers, e.g. 555-1212
// this group is named "phoneGroup"
string phoneRegExp = @"(?<phoneGroup>\d\d\d\-\d\d\d\d)";
// create a MatchCollection object to store the matches
MatchCollection myMatchCollection =
Regex.Matches(text, areaCodeRegExp + " " + phoneRegExp);
// use a foreach loop to iterate over the Match objects in
// the MatchCollection object
foreach (Match myMatch in myMatchCollection)
{
// display the "areaCodeGroup" group match directly
Console.WriteLine("Area code = " + myMatch.Groups["areaCodeGroup"]);
// display the "phoneGroup" group match directly
Console.WriteLine("Phone = " + myMatch.Groups["phoneGroup"]);
// use a foreach loop to iterate over the Group objects in
// myMatch.Group
foreach (Group myGroup in myMatch.Groups)
{
// use a foreach loop to iterate over the Capture objects in
// myGroup.Captures
foreach (Capture myCapture in myGroup.Captures)
{
Console.WriteLine("myCapture.Value = " + myCapture.Value);
}
}
}
}
}

</source>

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