net9.0
namespace System.Text.RegularExpressions
{
    public class Regex : ISerializable
    {
        public static int Count(string! input, [StringSyntax("Regex")] string! pattern);
    }
}
Assembly System.Text.RegularExpressions , Version=9.0.0.0, PublicKeyToken=b03f5f7f11d50a3a
Implementation Source
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.NET 7.08.09.0
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04/30/2024
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