语音识别语法：通配符

Question

我希望我的语法中有一个“搜索X”，下面的代码可以正常工作，但只有一部分可以说，当输入为Search *时，我的输入为Search ABC

private void Form1_Load(object sender, EventArgs e)
{
    Choices commands = new Choices();
    commands.Add(new string[] { @"search *" });
    GrammarBuilder gBuilder = new GrammarBuilder();
    gBuilder.Append(commands);
    gBuilder.Culture = new System.Globalization.CultureInfo("en-GB");
    Grammar grammar = new Grammar(gBuilder);

    recEngine.LoadGrammarAsync(grammar);
    recEngine.SetInputToDefaultAudioDevice();
    recEngine.SpeechRecognized += RecEngine_SpeechRecognized;
}
private void RecEngine_SpeechRecognized(object sender, SpeechRecognizedEventArgs e)
{
    if (e.Result.Text == @"search *")
    {
        synthesizer.SpeakAsync(e.Result.Text);
    }
}

谢谢！