Trim Method,Equals,Replace and Insert Methods,StringBuilder and Split and Join Methods

Trim Method

Trim removes leading and trailing white space. String data often has leading or trailing white space characters—newlines, spaces or tabs. These characters are usually not needed. With Trim we strip these characters in a declarative way.

Eg:- Module Module1

    Sub Main()

        ' Input string.

        Dim value As String = "  This is an example string. "

        ' Invoke Trim function.

        value = value.Trim()

        ' Write output.

        Console.Write("[")

        Console.Write(value)

        Console.WriteLine("]")

    End Sub

End Module

Output

[This is an example string.]

Equals

VB.NET String Equals function is to check the specified two String Object values are same or not.

System.String.Equals(String str1, String str2) As Boolean

Parameters:

String str1 : The String argument

String str2 : The String argument

Eg:-Dim str1 As String = "Equals"

        Dim str2 As String = "Equals"

        If String.Equals(str1, str2) Then

            MsgBox("Strings are Equal() ")

        Else

            MsgBox("Strings are not Equal() ")

        End If

Replace and Insert Methods

Replace. This changes the contents of a String. It makes all instances of one substring become another substring. The Replace function on String is often useful.

Eg:- Module Module1

    Sub Main()

        ' Assign string to literal.

        Dim value1 As String = "XXPractical"

        Console.WriteLine(value1)

        ' Replace substring with another substring.

        Dim value2 As String = value1.Replace("XX", "Lab")

        Console.WriteLine(value2)

    End Sub

End Module

Output

XXPractical

LabPractical

StringBuilder:- This class has a Replace() that functions the same way as the String method. It has parameters that indicate the before and after substrings.

Eg:- Imports System.Text

Module Module1

    Sub Main()

        ' Create new StringBuilder and initialize it.

        Dim builder As New StringBuilder("This is an example.")

        Console.WriteLine(builder)

        ' Replace string in StringBuilder.

        builder.Replace("This", "Here")

        Console.WriteLine(builder)

        ' Insert into StringBuilder.

        builder.Insert(0, "Sentence: ")

        Console.WriteLine(builder)

    End Sub

End Module

Output

This is an example.

Here is an example.

Sentence: Here is an example.

Split and Join

The VB.Net Split() extracts the substrings from the given string that are delimited by the separator parameter, and returns those substrings as elements of an array.

Public Function Split(ByVal ParamArray separator() As Char) As String()

Eg:- Dim str As String

        Dim strArr() As String

        Dim count As Integer

        str = "vb.net split test"

        strArr = str.Split(" ")

        For count = 0 To strArr.Length - 1

            MsgBox(strArr(count))

        Next

Join combines many string elements into a single string. It acts on an array or List. By using the Join function, we collapse these collections into String instances. This can help with file handing, or for storage of data in a database.

Eg:-1. Module Module1

    Sub Main()

        ' Three-element array.

        Dim array(2) As String

        array(0) = "A"

        array(1) = "B"

        array(2) = "C"

        ' Join array.

        Dim result As String = String.Join(",", array)

        ' Display result.

        Console.WriteLine(result)

    End Sub

End Module

Output

A,B,C

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