CODEWITHSUNDEEP
vb.netstringsubstringreverse
Rusmir
Rusmir

Reputation: 43

String trim from back to specific three characters

How can I trim some string until I got three specific characters which are the same as, for example, "xyz". To be precise I will give an example:

Dim String1 as String = "GunsAndRosesWelcomeToTheJungle" 
Dim String2 as String = "DontCry"
Dim ResultString as String

I need to remove everything from right until I get "moc" (reverse "com") in String1 and add string2 to get ResultString.

The ResultString should be: "GunsAndRosesWelDontCry"

Upvotes: 0

Views: 409

Answers (2)

Vivek S.
Vivek S.

Reputation: 21905

You can try this way,

Dim String1 As String = "GunsAndRosesWelcomeTocomeThecomJunglecom"
Dim String2 As String = "DontCry"
Dim ResultString As String
Dim ar As String() = String1.Split("com")
ResultString = ar(0) & String2

Demo

Upvotes: 0

Ian
Ian

Reputation: 30813

You could use String.IndexOf and the String.Substring and start from in front to solve it:

Dim String1 as String = "GunsAndRosesWelcomeToTheJungle" 
Dim String2 as String = "DontCry"
Dim index = String1.IndexOf("com")
Dim ResultString as String = String1.Substring(0, index) + String2

Edit:

If both the substring input and the string need to be reversed for one reason or another, I would introduce a reverse string function like this

Private Function Reverse(Val As String) As String
    Dim charArray As Char() = Val.ToCharArray()
    Array.Reverse(charArray)
    Return New String(charArray)
End Function

And then use it like this

Dim String1 As String = "GunsAndRosesWelcomeToTheJungle"
Dim String2 As String = "DontCry"        
Dim index = String1.Length - Reverse(String1).IndexOf(Reverse("com")) - ("com").Length
Dim ResultString As String = String1.Substring(0, index) + String2

Else, we can use String.LastIndexOf

Dim String1 as String = "GunsAndRosesWelcomeToTheJungle" 
Dim String2 as String = "DontCry"
Dim index = String1.LastIndexOf("com")
Dim ResultString as String = String1.Substring(0, index) + String2

Upvotes: 2

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