Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people, just like you, are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions

VB.Net  How to check a string against many other strings

Posted on 2013-01-19
Last Modified: 2013-01-19
Hi Experts.   I have a simple string "abc" that must be matched against a list of about 350 other strings that are split  into about 20 groups.  Some strings within a group are always the same and will be hardcoded but some are dynamic and must be supplied by the user.
If a match is found then I need to increment a number by one to show that the string matched something in that group.

So  "abc" is matched against

Group One

Group Two

Group Three

And so group three would be incremented by 1

I though I could do "If Then ElseIf"  but with the user defined values it got lengthy and complicated.   Whats the correct way to do this??   Any help appreciated.
Question by:PNRT
  • 3
  • 3

Expert Comment

ID: 38796187
which framework ?

Author Comment

ID: 38796205
Currently 2 and would prefer to stay there but could go to 4 if there was good reason
Thanks for the reply

Expert Comment

ID: 38796443
I don't know how you define groups, so I can imagine it is some kind of object. I would define a group like this
public class groups 
public str as list(of string) = nothing 
public matched as int32 = 0 

Open in new window

then you can define a list of groups and search the string inside each group like this :
dim p as list(of groups) = new list(of groups)

now you can populate elements of the list and when you populate all of 350 groups
can search with a simple for each like this
For Each el As groups In groups
 if el.str.contains("abc") then el.matched +=1 

Open in new window

Networking for the Cloud Era

Join Microsoft and Riverbed for a discussion and demonstration of enhancements to SteelConnect:
-One-click orchestration and cloud connectivity in Azure environments
-Tight integration of SD-WAN and WAN optimization capabilities
-Scalability and resiliency equal to a data center


Author Comment

ID: 38796513
Thanks for the help, this sounds exactly what I'm looking for but I'm struggling.   Firstly I had defined the groups into lists of strings and would like to keep this as it was quite lengthy

I created a new class with

Public Class Groups
    Public str As List(Of String) = Nothing
    Public matched As Int32 = 0
End Class

Then when I use

        Dim p As List(Of Groups) = New List(Of Groups)
        For Each el As Groups In Groups
            If el.str.Contains("abc") Then el.matched += 1

I get the error ......   Groups' is a type and cannot be used as an expression

Accepted Solution

sognoct earned 500 total points
ID: 38796537
sorry I did not debug was just an example on the fly ... here is a working code

Public Class Groups
    Public str As New List(Of String)
    Public matched As Int32 = 0

    Public Sub New(ByVal str2split As String)
      For i As Int32 = 0 To (str2split.Length / 3) - 1
        str.Add(str2split.Substring(i * 3, 3))
    End Sub

  End Class

    Dim sp As New List(Of Groups)
    sp.Add(New Groups("hsgusytstaab"))
    sp.Add(New Groups("osypautfr"))
    sp.Add(New Groups("abcahz"))

    For Each el As Groups In sp
      If el.str.Contains("abc") Then
        el.matched += 1
      End If

Open in new window


Author Closing Comment

ID: 38796552
Worked Great, many thanks

Featured Post

Free Tool: Site Down Detector

Helpful to verify reports of your own downtime, or to double check a downed website you are trying to access.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

A while ago, I was working on a Windows Forms application and I needed a special label control with reflection (glass) effect to show some titles in a stylish way. I've always enjoyed working with graphics, but it's never too clever to re-invent …
Since .Net 2.0, Visual Basic has made it easy to create a splash screen and set it via the "Splash Screen" drop down in the Project Properties.  A splash screen set in this manner is automatically created, displayed and closed by the framework itsel…
A short tutorial showing how to set up an email signature in Outlook on the Web (previously known as OWA). For free email signatures designs, visit https://www.mail-signatures.com/articles/signature-templates/?sts=6651 If you want to manage em…
Finds all prime numbers in a range requested and places them in a public primes() array. I've demostrated a template size of 30 (2 * 3 * 5) but larger templates can be built such 210  (2 * 3 * 5 * 7) or 2310  (2 * 3 * 5 * 7 * 11). The larger templa…

856 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question