vb.net max number in comma seperated string

I have a process that will build a string...

I need the ability to match a "set of numbers" against that
Pick out the highest number
And remove the lower numbers from the original string

Example
Original String  is "1,2,5,1002,1003,1004,1005"
Match Set  "1002,1003,1004"... in this 1004 is obviously the highest number

My revised original set is now "1,2,5,1004,1005"
Larry Bristersr. DeveloperAsked:
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

Fernando SotoRetiredCommented:
Hi lrbrister;

This should do what you need.
'' Original Data
Dim original As String = "1,2,5,1002,1003,1004,1005"
Dim matchSet As String = "1002,1003,1004"
'' Hold Intermediary results
Dim originalList As New List(Of Integer)
Dim matchSetList As New List(Of Integer)
original.Split(New Char() {","c}).ToList().ForEach(Sub(s) originalList.Add(Integer.Parse(s)))
matchSet.Split(New Char() {","c}).ToList().ForEach(Sub(s) matchSetList.Add(Integer.Parse(s)))
'' Remove the high value from the matchSet 
matchSetList.Remove(matchSetList.Max())
'' Remove the values in originalList that remain in matchSetList
matchSetList.ForEach(Sub(i) originalList.Remove(i))
'' Turn the originalList to to a string
original = originalList.Aggregate("", Function(a, n) a & "," & Integer.Parse(n)).TrimStart(","c)

Open in new window

0

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
anarki_jimbelCommented:
"Classic style" solution :)

Module Module1

    Sub Main()
        Dim s1 As String = "1,2,5,777,1002,1003,1004,1005"
        Dim s2 As String = "17,1002,1003,1004"
        Dim sResult As String = matchSets(s1, s2)
        Console.WriteLine(sResult)
        Console.ReadLine()
    End Sub

    Private Function matchSets(setString1 As String, setString2 As String) As String
        Dim result As String = Nothing
        Dim set1 As String() = setString1.Split(New Char() {","c}, StringSplitOptions.RemoveEmptyEntries)
        Dim set2 As String() = setString2.Split(New Char() {","c}, StringSplitOptions.RemoveEmptyEntries)
        ' from the examples given we suggest that numbers are sorted 
        Dim nextIndex As Integer = 0
        For j As Integer = 0 To set2.Length - 2 Step 1 ' loop on the matching set
            For i = nextIndex To set1.Length - 1 Step 1 'loop on the set to be matched
                If set2(j) = set1(i) Then
                    set1(i) = Nothing
                    nextIndex = i + 1
                    Exit For
                End If
            Next
        Next
        result = String.Join(",", set1)
        While result.IndexOf(",,") > -1
            result = result.Replace(",,", ",")
        End While

        Return result
    End Function

End Module

Open in new window

0
Larry Bristersr. DeveloperAuthor Commented:
Hey guys...
I'll take a look as soon as I get back to my office
0
Larry Bristersr. DeveloperAuthor Commented:
Hey guys... I truly thought I had already split the points.
No objection to awarding as suggested.
0
Fernando SotoRetiredCommented:
Both solutions answered the question.
0
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
.NET Programming

From novice to tech pro — start learning today.

Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.