Group.cs

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namespace System.Text.RegularExpressions;
 
public class Group : Capture
{
    internal static readonly Group s_emptyGroup = new Group(string.Empty, Array.Empty<int>(), 0, string.Empty);
 
    internal readonly int[] _caps;
 
    internal int _capcount;
 
    internal CaptureCollection _capcoll;
 
    public bool Success => _capcount != 0;
 
    public string Name { get; }
 
    public CaptureCollection Captures => _capcoll ?? (_capcoll = new CaptureCollection(this));
 
    internal Group(string text, int[] caps, int capcount, string name)
        : base(text, (capcount != 0) ? caps[(capcount - 1) * 2] : 0, (capcount != 0) ? caps[capcount * 2 - 1] : 0)
    {
        _caps = caps;
        _capcount = capcount;
        Name = name;
    }
 
    public static Group Synchronized(Group inner)
    {
        if (inner == null)
        {
            ThrowHelper.ThrowArgumentNullException(ExceptionArgument.inner);
        }
        CaptureCollection captures = inner.Captures;
        if (inner.Success)
        {
            captures.ForceInitialized();
        }
        return inner;
    }
}