In this article we will learn how to use string functions in VB.NET.
String Function - These are the following sting functions.
1. The Len Function
The length function is used to find out the number of characters in any given string.
Syntax
Len(string)
2. The Mid function
The mid function is used to Return a substring containing a specified number of characters from a string.
Syntax
Mid (string, start[, length])
string - String expression from which characters are returned.
start - Long. Character position in string at which the part to be taken begins.
length - Length is Optional. Number of characters to return.
3. The Left Function
The Left function extract the left portion of a string.
Syntax
Left("string", n)
4. The Right Function
The Right function extract the right portion of a string.
Syntax
Right("string", n)
5. The Space Function
The space function is used to Return a string containing the specified number of blank spaces.
Syntax
Space (number)
6. The Replace Function
The replace function is used to replacing some text in a string with some other text.
Syntax
Replace( string, searchtext, replacetext )
7. The Trim function
The trim function trims the empty spaces on both side of the String.
Syntax
Trim ("String")
8. The Ltrim Function
The Ltrim function trims the empty spaces of the left portion of the string.
Syntax
Ltrim("string")
9. The Rtrim Function
The Rtrim function trims the empty spaces of the Right portion of the string.
Syntax
Rtrim("string")
10. The Ucase and the Lcase Functions
The Ucase function converts all the characters of a string to capital letters. On the other hand, the Lcase function converts all the characters of a string to small letters.
For Example - This example defines all the above function.
Module Module1
Sub Main()
Dim leng As String = Len(" Rohatash kumar")
Console.WriteLine("length is :" & leng)
Dim middle As String = Mid("Rohatash Kumar", 3, 4)
Console.WriteLine("Mid is :" & middle)
Dim leftf As String = Left("Rohatash Kumar", 3)
Console.WriteLine("Left is:" & leftf)
Dim rightr As String = Right("rohatash kumar", 6)
Console.WriteLine("Right is :" & rightr)
Dim spaces As String = Right("rohatash kumar", 7)
Console.WriteLine("Space is :" & spaces)
Dim replaces As String = Replace("rohatash kumar", "hat", "nmo")
Console.WriteLine("Replace is :" & replaces)
Dim trimt As String = Trim(" rohatash kumar ")
Console.WriteLine("Trim is :" & trimt)
Dim ltriml As String = LTrim(" rohatash kumar ")
Console.WriteLine("ltrim is :" & ltriml)
Dim rtrimr As String = RTrim(" rohatash kumar ")
Console.WriteLine("rtrim is :" & rtrimr)
Dim ucaseu As String = UCase("rohatash kumar")
Console.WriteLine("Ucase is :" & ucaseu)
Dim lcasel As String = LCase("ROHATASH KUMAR")
Console.WriteLine("Ucase is :" & lcasel)
End Sub
End Module
Now run the console application.
Figure 1.