Several Methods for separating strings in C # (mentioned earlier)

Recently I have seen many posts in the forum asking how to use split to split strings. Here I will make some simple summary of split, hoping to help you. The following describes several methods:

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 ());