c#用正则表达式获得指定开始和结束字符串中间的一段文本

时间:2022-03-24 18:46:18

 

  
  
  
/// <summary>
/// 获得字符串中开始和结束字符串中间得值
/// </summary>
/// <param name="str">字符串</param>
/// <param name="s"> 开始 </param>
/// <param name="e"> 结束 </param>
/// <returns></returns>
public static string GetValue( string str, string s, string e)
{
Regex rg
= new Regex( " (?<=( " + s + " ))[.\\s\\S]*?(?=( " + e + " )) " , RegexOptions.Multiline | RegexOptions.Singleline);
return rg.Match(str).Value;
}

 

 

 

 

  
  
  
/// <summary>
/// 截取字符串过多+……
/// </summary>
/// <param name="inputString"> 字符串 </param>
/// <param name="len"> 长度 </param>
/// <returns> string </returns>
public static string CutString( string inputString, int len)
{
ASCIIEncoding ascii
= new ASCIIEncoding();
int tempLen = 0 ;
string tempString = "" ;
byte [] s = ascii.GetBytes(inputString);
for ( int i = 0 ; i < s.Length; i ++ )
{
if (( int )s[i] == 63 )
{
tempLen
+= 2 ;
}
else
{
tempLen
+= 1 ;
}

try
{
tempString
+= inputString.Substring(i, 1 );
}
catch
{
break ;
}

if (tempLen > len)
break ;
}
// 如果截过则加上半个省略号
byte [] mybyte = System.Text.Encoding.Default.GetBytes(inputString);
if (mybyte.Length > len)
tempString
+= " " ;

return tempString;
}

 

 

 

string get字符串="01-蓝";
string get后 = get字符串.Substring(0, get字符串.IndexOf("-"));
这样获取的数据是:蓝
   
   
   
string get后 = get字符串.Substring(get字符串.IndexOf( " - " ),get字符串.Length - get字符串.IndexOf( " - " ));

 


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