VB.NET function to check starting substring

I am looking for VB.NET function to check if a string is starting with anything between 500 to 599

Example strings
   523 Doc1

The valid strings from the above are
   523 Doc1
Sam OZAsked:
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Ryan ChongSoftware Team LeadCommented:
try like:

Dim yourString() As String = {"523 Doc1", "Doc1", "5002Doc2", "Document523SubDoc", "522-Doc3"}
        Dim resultString() As String
        Dim cnt As Integer = 0
        Dim num As Integer

        For Each value As String In yourString
            Dim startNo As String = Regex.Match(value, "^\d+").Value
            Integer.TryParse(startNo, num)

            If num >= 500 And num <= 599 Then
                ReDim Preserve resultString(cnt)
                resultString(cnt) = value
                cnt = cnt + 1
            End If

        MsgBox(String.Join(vbCrLf, resultString))

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Sam OZAuthor Commented:
Thanks . But I don't need this to come as an array . At one time only one string is taken ( For example Doc1).  The function just need to check the rule of 5xx and return true or false
I hope the StartNo variable is god enough
Ryan ChongSoftware Team LeadCommented:
yup, similar concept applied for one string, hence use the part mentioned below should be good enough:

Dim startNo As String = Regex.Match(value, "^\d+").Value
            Integer.TryParse(startNo, num)

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and then refer to the value of num
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