[ Split String in VB.Net but only if meets a certain format ]

I have the following code to split a string but it sometimes splits a word I do not intend to split.

For example it will split "LFMT" but I only want it to split a string with this format "FM123456".

The code is below;

Dim strSplitTAF() = New String() {"TEMPO", "PROB30", "PROB40", "BECMG", "FM"}

For Each strWord As String In strSplitTAF
    strTAF = strTAF.Replace(strWord, Environment.NewLine & strWord)
Next

Do you have any ideas?

Thanks in advance.

Answer 1

To check for the right format, use the following condition

    If Str1.Length = 8 AndAlso Str1.Substring(0, 2) = "FM" AndAlso IsNumeric(Str1.Substring(2, 6)) Then 
        'The code goes here
    End If

Replace the Str1 with the variable that has the format "FM123456"

EDIT

check if this is what you want

    'Test data for strTAF
    Dim strTAF As String = "TEMPO Test1 PROB30 Test2 PROB40 Test3 BECMG Test4 FM123456 Test5 LFMT Test6 FM654321 Test7 FM124"

    'FM is removed since it will use a specific condition to split the string (FM + 6 numbers)
    Dim strSplitTAF() = New String() {"TEMPO", "PROB30", "PROB40", "BECMG"}

    For Each strWord As String In strSplitTAF
        strTAF = strTAF.Replace(strWord, Environment.NewLine & strWord)
    Next

    'Removes the new line on the first line (optional)
    strTAF = strTAF.Trim

    'Finds the index of the first FM in the string
    Dim Index As Integer = strTAF.IndexOf("FM")

    While Index > -1
        'Checks if the index + 8 (FM + 6 numbers) exceeds the length of the strTAF
        If Index + 8 <= strTAF.Length Then
            'Checks if the string (consecutive 6 chars) after FM is numeric
            If IsNumeric(strTAF.Substring(Index + 2, 6)) Then
                strTAF = strTAF.Substring(0, Index) & Environment.NewLine & strTAF.Substring(Index)
            End If
        Else
            Exit While
        End If

        'Gets the new index of FM
        Index = strTAF.IndexOf("FM", Index + 8)
    End While