How to find a random number in string

Posted on 2011-02-25
Last Modified: 2012-06-27

I can't seem to find a way for searching for  random number in a string. for example

"150 Opening BINARY mode data connection.
226 Transfer complete
ftp: 5590252 bytes sent in 9.45Seconds 591.31Kbytes/sec."

I need to find the number that is in bold above which could be a different number every time and be placed in a different position. It will however, always be after  "ftp: ". I then need to assign that number to a variable int.

Can anyone help on this please?

Question by:Michael Roodt
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LVL 33

Expert Comment

by:Todd Gerbert
ID: 34983603
The line doesn't always start with "ftp:"?  i.e., it could sometimes be "Some other stuff ftp: 123345 etc etc"?
LVL 75

Accepted Solution

käµfm³d   👽 earned 250 total points
ID: 34983606
Try this:
Imports System.Text.RegularExpressions


Dim value As Integer
Dim m As Match = Regex.Match(sourceStr, "(?<=ftp: *)\d+")

If m.Success Then
    value = Convert.ToInt32(m.Value)
    value = -1
End If

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LVL 33

Assisted Solution

by:Todd Gerbert
Todd Gerbert earned 250 total points
ID: 34983648
Almost same thing:

Imports System.Text.RegularExpressions
Module Module1

    Sub Main()
        Dim re As New Regex("ftp:\s+(\d+)\b")

        Dim test = "150 Opening BINARY mode data connection.226:    Transfer(complete) ftp: 5590252 bytes sent in 9.45Seconds 591.31Kbytes/sec."

        Dim m = re.Match(test)
        If m.Success Then
            Dim byteCount As Long
            If Int64.TryParse(m.Groups(1).Value, byteCount) Then
                Console.WriteLine("Found number: {0}", byteCount)
            End If
        End If

    End Sub

End Module

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LVL 75

Expert Comment

by:käµfm³d 👽
ID: 34983698
The one caveat to tgerbert's pattern, and I don't think it will come to play here, is that if the number following "ftp: " were not followed by a space and had a string immediately following it (e.g.  "ftp: 5590252bytes"), then the match would fail due to the use of the word boundary at the end of the pattern. Again, I don't perceive that to be an issue here  = )

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