使用LINQ计数字符串中的子？ [英] Using linq to count substrings in a string?

问题描述

我可以使用下面的linq表达式计算一个单词的出现次数，如下所示：

I could use the following linq expression to count the number of occurrences of a word as follows:

string test = "And And And";
int j = test.Split(' ').Count(x => x.Contains("And"));

但是如果我正在搜索And And，有没有办法使用linq字不使用拆分。

However what if I was searching for "And And", Is there a way to use linq to count words without using split. Do any of these methods take longer the O(n)?

推荐答案

您可以使用正则表达式：

You can use a regular expression:

string test = "And And And";
int j = Regex.Matches(test, "And").Cast<Match>().Count();

BTW，您要允许重叠发生吗？如果你在寻找And And，你认为 test 包含1次或2次吗？

BTW, do you want to allow overlapping occurrences? i.e. if you're looking for "And And", do you consider that test contains 1 or 2 occurrences of it?

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