Usage of substring () and split in C #

String. substring (INT index, int length)
Index: Start position, starting from 0
Length: the length of the substring you want to obtain

Example:
Using system;
Using system. Collections. Generic;
Using system. text;

Namespace str_sub
{
Class Program
{
Static void main (string [] ARGs)
{
String mystring = "Hello word! ";

// Substring () has two overload functions in C #
// Example

String substring1 = mystring. substring (0 );

// If the input parameter is an integer greater than or equal to 0,
// Start with the long position,
// All the remaining strings are taken after the truncation.
// If the input value is smaller than 0,
// The system throws an argumentoutofrange exception.
// Indicates that the parameter range is out of bounds.

String substring2 = mystring. substring (0, 5 );

// If two long integer parameters are input,
// The first one is the starting position of the original string.
// The last parameter is the length of the substring.
// The above exception also occurs if the conditions are not met

Console. writeline (substring1 );
Console. writeline (substring2 );
Console. Readline ();
}
}
}

Program output result:

Hello word!
Hello

 

// ++

1. Separated by strings:
Using system. Text. regularexpressions;

 

String STR = "aaajsbbbjsccc ";

String [] sarray = RegEx. Split (STR, "JS", regexoptions. ignorecase );

Foreach (string I in sarray) response. Write (I. tostring () + "<br> ");

Output result:
Aaa
Bbb
CCC
 

2. Separate multiple characters:

String STR = "aaajbbbscccjdddseee ";

String [] sarray = Str. Split (New char [2] {'J','s '});

Foreach (string I in sarray) response. Write (I. tostring () + "<br> ");

Output result:
Aaa
Bbb
CCC
Ddd
Eee
 

3. Separate them with a single character:

String STR = "aaajbbbjccc ";

String [] sarray = Str. Split ('J ');

Foreach (string I in sarray) response. Write (I. tostring () + "<br> ");

Output result:
Aaa
Bbb
CCC

 

// ++

Method 1:
String S = "abcdeabcdeabcde ";
String [] sarray = S. Split ('C ');
Foreach (string I in sarray)
Console. writeline (I. tostring ());
Console. readkey ();
Output the following results:
AB
Deab
Deab
De

Method 2:
We can see that the result is separated by a specified character. Use another constructor to separate multiple characters:
String S = "abcdeabcdeabcde ";
String [] sarray1 = S. Split (New char [3] {'C', 'D', 'E '});
Foreach (string I in sarray1)
Console. writeline (I. tostring ());
You can output the following results:
AB
AB
AB

Method 3:
In addition to the above two methods, the third method is to use a regular expression. Create a console project. Then add reference: using system. Text. regularexpressions;
String content = "agcyongfa365macyongfa365gggyongfa365ytx ";
String [] resultstring = RegEx. Split (content, "yongfa365", regexoptions. ignorecase );
Foreach (string I in resultstring)
Console. writeline (I. tostring ());
Console. readkey ();
Output the following results:
AGC
Mac
Ggg
Ytx

Method 4:
String str1 = "My ***** is ************************ Teacher ";
String [] str2;
Str1 = str1.replace ("*****","*");
Str2 = str1.split ('*');
Foreach (string I in str2)
Console. Write (I. tostring ());
Console. readkey ();

The most commonly used is str. Replace ("\ r \ n", "\ r"). Split ('\ R ')

Method 5:
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 is a space in the middle of the output, so the output result is not the expected result, which returns to the regular expression, then you 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. Write (I. tostring ());
Console. readkey ();
Here, we achieved our goal through \ * +.