Question

I m working in .net c# and I have a string text = "Whatever text FFF you can FFF imagine"; What i need is to get the quantity of times the "FFF" appears in the string text. How can i acomplished that? Thank you.

Answer 1

您可以使用正则表达式来匹配任何您想要的内容。

string s = "Whatever text FFF you can FFF imagine";

Console.WriteLine(Regex.Matches(s, Regex.Escape("FFF")).Count);

Answer 2

这里有两种方法。请注意，正则表达式应该使用单词边界的元字符，以避免错误的匹配到其他单词中的出现。到目前为止发布的解决方案没有这样做，这将错误地计算“fooFFFbar”中的“FFF”作为匹配。

string text = "Whatever text FFF you can FFF imagine fooFFFbar";

// use word boundary to avoid counting occurrences in the middle of a word
string wordToMatch = "FFF";
string pattern = @"" + Regex.Escape(wordToMatch) + @"";
int regexCount = Regex.Matches(text, pattern).Count;
Console.WriteLine(regexCount);

// split approach
int count = text.Split(   ).Count(word => word == "FFF");
Console.WriteLine(count);

Answer 3

Regex.Matches(text, "FFF").Count;

Answer 4

请使用 System.Text.RegularExpressions.Regex 来完成此操作：

string p = "Whatever text FFF you can FFF imagine";
var regex = new System.Text.RegularExpressions.Regex("FFF");
var instances = r.Matches(p).Count;
// instances will now equal 2,

Answer 5

这里除了经常表述外,还有一种选择:

string s = "Whatever text FFF you can FFF imagine FFF";
//Split be the number of non-FFF entries so we need to subtract one
int count = s.Split(new string[] { "FFF" }, StringSplitOptions.None).Count() - 1;

如果需要的话，您可以轻松地调整它以使用几个不同的字符串。

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