C＃。解析并找到字符串中的某个单词

var input = \"bla bla bla bla  <I NEED THIS TEXT> \";

var match = Regex.Match(input, @\".*?<(?<MyGroup>.*?)>\");
if (match.Success)
    var text = match.Groups[\"MyGroup\"].Value;

int start = s.IndexOf(\"<\") + 1;
int end = s.IndexOf(\">\",start);

string text = s.Substring(start,end - start);

Substring

<

>

IndexOf

var s = \"bla bla bla bla  <I NEED THIS TEXT> \";
Console.WriteLine(s.Substring(s.IndexOf(\'<\') + 1, s.IndexOf(\'>\') - s.IndexOf(\'<\') - 1));

Regex.Match(input, \"<(.*)>\").Groups[1].Value

static void Main()
{
    string s = \"hello<I NEED <I NEED THIS TEXT> THIS TEXT>goodbye\";

    string r = Regex.Match(s, \"<(.*)>\").Groups[1].Value;

    int start = s.IndexOf(\"<\") + 1;
    int end = s.IndexOf(\">\", start);
    string t = s.Substring(start, end - start);

    Console.WriteLine(r);
    Console.WriteLine(t);

    Console.ReadKey();
}

var data = \"bla bla bla bla <I NEED THIS TEXT>\";

int start = 0, end = 0;
if ((start = data .IndexOf(\"<\")) > 0 &&
    (end = data .IndexOf(\">\", start)) > 0)
{
    var result = data .Substring(start + 1, end - start - 1);
}

var input = \"bla bla bla bla  <I NEED THIS TEXT>\";
Match match = Regex.Match(input, @\"<([^>]*)>\");
if (match.Success)
{
    // Do some with match.Groups[1].Value;
}