C # split string

Method 1: Open vs.net to create a console project. Enter the following program in the main () method.
 

 
String S = "abcdeabcdeabcde ";
 
String [] sarray = S. Split ('C ');
 
Foreach (string I in sarray)
 
Console. writeline (I. tostring ());
 

 
Output the following result: AB
 
Deab
 
Deab
 
De
 

 

 
We can see that the result is separated by a specified character. What if we want to use multiple characters for segmentation, such as C, D, and E? Well, we use another constructor:
 

 
Change to string S = "abcdeabcdeabcde
 
String [] sarray1 = S. Split (New char [3] {'C', 'D', 'E '});
 
Foreach (string I in sarray1)
 
Console. writeline (I. tostring ());
 

 
The following result can be output: AB
 
AB
 
AB
 

 
In addition to the above two methods, the third method is to use a regular expression. Create a console project. Then add using system. Text. regularexpressions;
 
Main (): change
 

 
System. Text. regularexpressions
 
String content = "agcsmallmacsmallgggsmallytx ";
 
String [] resultstring = RegEx. Split (content, "small", regexoptions. ignorecase)
Foreach (string I in resultstring)
Console. writeline (I. tostring ());

Output the following result: AGC
Mac
Ggg
Ytx
What are the advantages of using regular expressions? Don't worry, we will see its uniqueness later.
The following describes 4th methods. For example
 
String str1 = "My ***** is ************************ Teacher ";
 
If I want to show that I am a teacher, what should I do? We can use the following code:
 

 

 
String str1 = "My ***** is ********************** teacher;
 
String [] str2;
 
Str1 = str1.replace ("*****","*");
 
Str2 = str1.split ('*');
 
Foreach (string I in str2)
 
Console. writeline (I. tostring ());
 

 

 
In this way, you can get the correct result. However, for example
 
String str1 = "I'm *** A ********************* Teacher ";
 
The result I want to display is: I am a teacher.
 
If I use the fourth method above, the following error will occur: I am a teacher.
 
There are spaces in the middle of the output, so the output result is not what I want. How can this problem be solved? This returns to the regular expression (here we can see its power), then we can use the fifth method below:
 

 
String str1 = "I'm *** A ********************* Teacher ";
 
String [] str2 = system. Text. regularexpressions. RegEx. Split (str1, @ "[*] + ");
 
Foreach (string I in str2)
 
Console. writeline (I. tostring ());