To intercept a Chinese-English mixed string of specified lengths in C #

String

We often do one thing, is in the article system, the interception of a certain length of the article title, more than the specified length, add "..."

such as two strings:
String str1 = "Chinese people want AH abc ~";
String str2 = "1 Chinese 23456abc ~";

To intercept, after the output:

str1 = "Chinese people want ...";
str2 = "1 Chinese 2 ...";

That is, the string to be mixed in Chinese and English, after the interception, the length should be consistent, that is, 8 bytes length (excluding three points), and can not appear in the middle of the case of truncated. So I wrote a method:

public static string Getstr (String s,int L)
    {   
    string temp = s;
    if (regex.replace (temp, "[\u4e00-\u9fa5]", "ZZ", Regexoptions.ignorecase). LENGTH<=L)
    {
        return temp;
   }
    for (int i=temp. length;i>=0;i--)
    {
        temp = temp. Substring (0,i);
        if (regex.replace (temp, "[\u4e00-\u9fa5]", "ZZ", Regexoptions.ignorecase). length<=l-3)
        {
             return temp + "";
       }   
   }
    Return "";
   }
Call:
String content = "Chinese AH abc yes";
Content = Getstr (content,13);