Does anyone know how can I removed the rest of string after a particular string or pattern?
For example: I save the html code into a string as below:
String test;
test = '<html xmlns="http://www.w3.org/1999/xhtml"><head runat="server"><title></title></head><body><table> <tr><td>test</td></tr> </table><div id="13"> </body> test test test test </html>'
How can I removed the rest of the text after <div id="13"> in C# .net?
If you want the ending token to be excluded, you can use this:
string test = "<html xmlns=\"http://www.w3.org/1999/xhtml\"><head runat=\"server\"><title></title></head><body><table> <tr><td>test</td></tr> </table><div id=\"13\"> </body> test test test test </html>";
string result = test.Split(new string[] { "<div id=\"13\">"}, StringSplitOptions.None).FirstOrDefault();
If you want the ending token to be included, you can use this:
string test = "<html xmlns=\"http://www.w3.org/1999/xhtml\"><head runat=\"server\"><title></title></head><body><table> <tr><td>test</td></tr> </table><div id=\"13\"> </body> test test test test </html>";
string endString = "<div id=\"13\">";
string result = test.Substring(0, test.IndexOf(endString) + endString.Length);
Beware that string literals must be enclosed in double quote characters and not apostrophes, and quote characters inside them must be escaped by preceding them with a \.
Also note that in my code I haven't done any type of validation, I leave that up to you. :)
result). The html presented in test would most likely be downloaded from the internet or read from a file and in that case would not require modification.
@ needs no escape sequences
There are many ways to achieve this / which to use depends upon your exact requirements (i.e. are you literally searching for <div id="13"> or do you want any div tag with a numeric id / do you care if it has other attributes / do you care about additional whitespace in the text / are you really using a string or are you parsing the html; etc.
Below is an example of how you could use a Regex to match the exact string. An advantage of this approach is it gives you a lot of flexibility, so should be easy to tweak as your requirements become better defined.
var regex = new Regex(".*?<div id=\"13\">");
var test = "<html xmlns=\"http://www.w3.org/1999/xhtml\"><head runat=\"server\"><title></title></head><body><table> <tr><td>test</td></tr> </table><div id=\"13\"> </body> test test test test </html>";
var match = regex.Match(test);
if (match.Success)
{
Console.WriteLine("Found!");
Console.WriteLine(match.Value);
}
Full Code:
using System;
using System.Text.RegularExpressions;
public class Program
{
public static void Main()
{
var regex = new Regex(".*?<div id=\"13\">");
var test = "<html xmlns=\"http://www.w3.org/1999/xhtml\"><head runat=\"server\"><title></title></head><body><table> <tr><td>test</td></tr> </table><div id=\"13\"> </body> test test test test </html>";
var match = regex.Match(test);
if (match.Success)
{
Console.WriteLine("Found!");
Console.WriteLine(match.Value);
}
else
{
Console.WriteLine("Not Found!");
}
Console.ReadLine();
}
}
<div id="13">doesn't have ending tag. Is there any special case about it?