这是一个简单的扩展方法，我用的：

 之间（此字符串SRC，串findfrom，串findto）公共静态字符串
{
    INT开始= src.IndexOf（findfrom）;
    int值= src.IndexOf（findto，启动+ findfrom.Length）;
    如果（开始℃的||到＆lt; 0）返回;
    字符串s = src.Substring（
                   启动+ findfrom.Length，
                   到 - 启动 -  findfrom.Length）;
    返回S;
}
 

有了这个，你可以使用

 字符串valueToFind = sourceString.Between（汽车=，＆LT; /值GT;）
 

---

您也可以尝试这样的：

 之间（此字符串SRC，串findfrom公共静态字符串，
                             PARAMS字符串[] findto）
{
    INT开始= src.IndexOf（findfrom）;
    如果（开始℃下）返回;
    的foreach（在findto串STO）
    {
        int值= src.IndexOf（申通快递，启动+ findfrom.Length）;
        如果（到大于= 0）返
            src.Substring（
                       启动+ findfrom.Length，
                       到 - 启动 -  findfrom.Length）;
    }
    返回 ;
}
 

通过这个可以给你多重结局令牌（它们的顺序很重要）

 字符串valueToFind = sourceString.Between（汽车=，;，＆LT; /值GT;）
 

I have a txt file as a string, and I need to find words between two characters and Ltrim/Rtrim everything else. It may have to be conditional because the two characters may change depending on the string.

Example:

car= (data between here I want) ;
car =  (data between here I want) </value>

Code:

 int pos = st.LastIndexOf("car=", StringComparison.OrdinalIgnoreCase);

                if (pos >= 0)
                {
                    server = st.Substring(0, pos);..............
                }

This is a simple extension method I use:

public static string Between(this string src, string findfrom, string findto)
{
    int start = src.IndexOf(findfrom);
    int to = src.IndexOf(findto, start + findfrom.Length);
    if (start < 0 || to < 0) return "";
    string s = src.Substring(
                   start + findfrom.Length, 
                   to - start - findfrom.Length);
    return s;
}

With this you can use

string valueToFind = sourceString.Between("car=", "</value>")

---

You can also try this:

public static string Between(this string src, string findfrom, 
                             params string[] findto)
{
    int start = src.IndexOf(findfrom);
    if (start < 0) return "";
    foreach (string sto in findto)
    {
        int to = src.IndexOf(sto, start + findfrom.Length);
        if (to >= 0) return
            src.Substring(
                       start + findfrom.Length,
                       to - start - findfrom.Length);
    }
    return "";
}

With this you can give multiple ending tokens (their order is important)

string valueToFind = sourceString.Between("car=", ";", "</value>")