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<>字符串截取的几种基本方法
string str=“123abc456”;
int i=3;
1 取字符串的前i个字符
str=str.Substring(0,i); // or str=str.Remove(i,str.Length-i);
2 去掉字符串的前i个字符:
str=str.Remove(0,i); // or str=str.Substring(i);
3 从右边开始取i个字符:
str=str.Substring(str.Length-i); // or str=str.Remove(0,str.Length-i);
4 从右边开始去掉i个字符:
str=str.Substring(0,str.Length-i); // or str=str.Remove(str.Length-i,i);
5 判断字符串中是否有"abc" 有则去掉之
using System.Text.RegularExpressions;
string str = “123abc456”;
string a=“abc”;
Regex r = new Regex(a);
Match m = r.Match(str);
if (m.Success)
{
//绿色部分与紫色部分取一种即可。
str=str.Replace(a,"");
Response.Write(str);
string str1,str2;
str1=str.Substring(0,m.Index);
str2=str.Substring(m.Index+a.Length,str.Length-a.Length-m.Index);
Response.Write(str1+str2);
}
6 如果字符串中有"abc"则替换成"ABC"
str=str.Replace(“abc”,“ABC”);
string str=“adcdef”; int indexStart = str.IndexOf(“d”);
int endIndex =str.IndexOf(“e”);
string toStr = str.SubString(indexStart,endIndex-indexStart);
截取字符串最后一个字符的问题!
str1.Substring(str1.LastIndexOf(",")+1)