Define groups 'ing', 'in', 'n'

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using System;
using System.Text.RegularExpressions;

class GroupingApp {
static void Main(string[] args) {
Regex r = new Regex(“(i(n))g”);
Match m = r.Match(“Matching”);
GroupCollection gc = m.Groups;
Console.WriteLine(“Found {0} Groups”, gc.Count);
for (int i = 0; i < gc.Count; i++) { Group g = gc[i]; Console.WriteLine("Found '{0}' at position {1}",g.Value, g.Index); } } } [/csharp]