[Resolved] Sub string within a string

Writers Block · Jun 17th, 2007, 06:17 PM

Hi

New to VB, but not to programming.

I need to search lines of text for substrings.

I recon LastIndexOfAny is the way to go.

As an example, if I wanted to find the last occurance of the word "for"

in: "This string is just for tests purposes and should not be taken for any other reasons."

When I have tried various ways I get it returning an index of one of the letters of 'for' or at least that is what it looks like.

I would be looking for a reply of 63 for the string above (presuming I counted corectly) as it's the last occurence of for. Not a return indicating the last occurance of 'o' instead or some other reply.

Code:

current_line = "This string is just for tests purposes and should not be used for any other reasons."
count2 = current_line.LastIndexOfAny("for")

Bulldog · Jun 17th, 2007, 06:23 PM

I get the result of 63 using "LastIndexOf" (the first character position is zero).

Code:

        Dim s As String = "This string is just for tests purposes and should not be taken for any other reasons."
        MessageBox.Show(s.LastIndexOf("for"))

Writers Block · Jun 17th, 2007, 06:37 PM

I get 80. As though it is returning the postion of a character in another word, not the whole word. And it is the whole word I am looking for.

Writers Block · Jun 17th, 2007, 06:40 PM

No matter i feel stupid. Got it now.

Jun 17th, 2007, 06:17 PM	#1
Writers Block New Member Join Date: Jun 07 Posts: 10	[Resolved] Sub string within a string Hi New to VB, but not to programming. I need to search lines of text for substrings. I recon LastIndexOfAny is the way to go. As an example, if I wanted to find the last occurance of the word "for" in: "This string is just for tests purposes and should not be taken for any other reasons." When I have tried various ways I get it returning an index of one of the letters of 'for' or at least that is what it looks like. I would be looking for a reply of 63 for the string above (presuming I counted corectly) as it's the last occurence of for. Not a return indicating the last occurance of 'o' instead or some other reply. Code: current_line = "This string is just for tests purposes and should not be used for any other reasons." count2 = current_line.LastIndexOfAny("for") Last edited by Writers Block; Jun 17th, 2007 at 06:43 PM. Reason: [Resolved]

Jun 17th, 2007, 06:23 PM	#2
Bulldog Frenzied Member Join Date: Jun 05 Location: South UK Posts: 1,653	Re: Sub string within a string I get the result of 63 using "LastIndexOf" (the first character position is zero). Code: Dim s As String = "This string is just for tests purposes and should not be taken for any other reasons." MessageBox.Show(s.LastIndexOf("for")) __________________ If my post helped you, please Rate it If your problem is solved please also mark the thread resolved I use VS2005/8 Standard (unless otherwise stated). _________________________________________________________________________________ B.Sc(Hons), AUS.P, C.Eng, MIET, MIEEE, MBCS / MCSE+Sec, MCSA+Sec, MCP, A+, Net+, Sec+, MCIWD, CIWP, CIWA I wrote my very first program in 1975, using machine code on a mechanical Olivetti teletype connected to an 8-bit, 78 instruction, 1MHz, Motorola 6800 multi-user system with 2k of memory. Using Windows, I dont think my situation has improved.

Jun 17th, 2007, 06:37 PM	#3
Writers Block New Member Join Date: Jun 07 Posts: 10	Re: Sub string within a string I get 80. As though it is returning the postion of a character in another word, not the whole word. And it is the whole word I am looking for.

Jun 17th, 2007, 06:40 PM	#4
Writers Block New Member Join Date: Jun 07 Posts: 10	Re: Sub string within a string No matter i feel stupid. Got it now.

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