关于c＃：查找匹配的单词

Find word which was the match

我有这样的代码，我在其中搜索数组中的单词字符串：

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string wordlist = synonymslistbox.Items[q_index].ToString().Split(':')[0].Replace(',', ' ');

var pattern = new Regex(@"\W");

var qa = pattern.Split(first_sentence).Any(w => wordlist.Contains(w));

现在我想做两件我不知道该怎么做的事。

找出哪个词是匹配词。如果找到，此代码只返回true。

当第一句话是i like my banjo时，它不应该在banjo中找到字母a作为单词a的位置。只有在这样的句子中，它才应该把a作为一个单独的单词来读：i like a big beer at the end of the afternoon。

find out witch word was a match. this one just returns true if found.

在以下情况下使用，而不是任何：

1	var qa = pattern.Split(first_sentence).Where(w => wordlist.Contains(w));

when first_sentences is"i like my banjo" then it should NOT find a in banjo as the word a. it should only read a as a single word when
it is in a sentence like this below"i like a big beer at the end of
the afternoon"

单词表不应是字符串，而应是字符串列表或数组。确保它是一个包含"a"的列表。除此之外，您的代码还可以工作