如何从正则表达式匹配中获取匹配的子表达式?(C#)

假设我正在匹配一个模式,该模式有如下子表达式:

Regex myRegex = new Regex("(man|woman|couple) seeking (man|woman|couple|aardvark)");

string myStraightText = "Type is man seeking woman, age is 44";
MatchCollection myStraightMatches = myRegex.Matches(myStraightText);

string myGayText = "Type is man seeking man, age is 39";
MatchCollection myGayMatches = myRegex.Matches(myGayText);

string myBizarreText = "Type is couple seeking aardvark, age is N/A";
MatchCollection myBizarreMatches = myRegex.Matches(myBizarreText);

在第一个匹配中,我想恢复第一个子表达式匹配“man”(而不是“woman”或“particle”)的信息,第二个子表达式匹配“woman”(而不是“man”或“particle”或“aardvark”)。而第二个匹配是“人”和“人”等。这个信息在 Match 对象

我只知道如何获得完整的匹配字符串。例如,

foreach (Match myMatch in myStraightMatches)
{
    tbOutput.Text += String.Format("{0}\n", myMatch);
}