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05.07.2008 at 08:56AM PDT, ID: 23383269
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Parse values in a string to an array
Tags: vb.net 2008
Is there any easy way to do this?
I would like to extract values from a string and get them into an array.
Here is a sample of what I am trying to do.The a b and c can vary in length.
str1 = "aaaa?val=ABC&bbbbb?val=DEFG&cccccc?val=HIJ&ddddddd"
I would like the result to be
array1(0) = ABC
array1(1)=DEFG
array1(2)=HIJ
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Question Stats
Zone: Programming
Question Asked By: gr8fulkev
Solution Provided By: Idle_Mind
Participating Experts: 3
Solution Grade: A
Views: 15
Translate:
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05.07.2008 at 09:01AM PDT, ID: 21517779

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05.07.2008 at 09:03AM PDT, ID: 21517787

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05.07.2008 at 09:38AM PDT, ID: 21518109

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05.07.2008 at 10:15AM PDT, ID: 21518434

Rank: Genius

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05.07.2008 at 11:13AM PDT, ID: 21518940

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05.07.2008 at 11:15AM PDT, ID: 21518957

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05.07.2008 at 11:35AM PDT, ID: 21519138

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05.07.2008 at 12:58PM PDT, ID: 21519847

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05.07.2008 at 09:01AM PDT, ID: 21517779
You could use this:
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array = str1.Split("?val=")
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05.07.2008 at 09:03AM PDT, ID: 21517787
No sorry, that actually doesn't work. Missed the aaaaa and &bbbbb and &cccccc...
 
05.07.2008 at 09:38AM PDT, ID: 21518109

Rank: Guru

You *could* do this procedurally with .IndexOf() and .SubString, but you really *should* use a Regular Expression instead.  Unfortunately, my regex is pretty bad so hopefully someone else can provide that for you.
 
05.07.2008 at 10:15AM PDT, ID: 21518434

Rank: Genius

Do something like this:
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        Dim str1 As String = "aaaa?val=ABC&bbbbb?val=DEFG&cccccc?val=HIJ&ddddddd"
 
        Dim values() As String = Strings.Split(str1.Replace("?val=", "&"), "&")
 
        Dim arr As New List(Of String)
        For i As Integer = 1 To values.Length - 1 Step 2
            arr.Add(values(i))
        Next
 
        For i As Integer = 0 To arr.Count - 1
            Debug.Print("arr(" & i & ") = " & arr(i))
        Next
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05.07.2008 at 11:13AM PDT, ID: 21518940
  This seems to work ok bit arr(0) wil be garbage. Any better ideas?      
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Dim str1 As String
        Dim arr As Array
        str1 = "aaaa?val=ABC&bbbbb?val=DEFG&cccccc?val=HIJ&ddddddd"
        arr = Split(str1.Substring(0, Len(str1)), "?val=")
        Dim i As Integer
        i = 0
        For Each item In arr
            If (arr(i).IndexOf("&") > 0) Then
                arr(i) = arr(i).Substring(0, arr(i).IndexOf("&"))
                MsgBox(arr(i))
            End If
            i = i + 1
        Next
        MsgBox(arr(0))
        MsgBox(arr(1))
        MsgBox(arr(2))
        MsgBox(arr(3))
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05.07.2008 at 11:15AM PDT, ID: 21518957

Rank: Genius

Did you try my example?...
 
05.07.2008 at 11:35AM PDT, ID: 21519138
the a b c stuff is HTML. It would not be safe to replace with &
 
05.07.2008 at 12:58PM PDT, ID: 21519847

Rank: Genius

Try this out then:
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        Dim str1 As String = "aaaa?val=ABC&bbbbb?val=DEFG&cccccc?val=HIJ&ddddddd"
        Dim arr1 As New List(Of String)
 
        Dim Tag1 As String = "?val="
        Dim Tag2 As String = "&"
        Dim Tag1Pos As Integer = str1.IndexOf(Tag1)
        Dim Tag2Pos As Integer
        While Tag1Pos <> -1
            Tag2Pos = str1.IndexOf(Tag2, Tag1Pos + Tag1.Length)
            If Tag2Pos <> -1 Then
                arr1.Add(str1.Substring(Tag1Pos + Tag1.Length, Tag2Pos - Tag1Pos - Tag1.Length))
                Tag1Pos = str1.IndexOf(Tag1, Tag2Pos + 1)
            Else
                Exit While
            End If
        End While
 
        For i As Integer = 0 To arr1.Count - 1
            Debug.Print("arr1(" & i & ") = " & arr1(i))
        Next
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Accepted Solution
 
 
20080236-EE-VQP-29 / EE_QW_2_20070628