Format string in vb.net

This is done pretty easily using System.Text.RegularExpressions.Regex.Replace using a Regular Expression with 4 groups in it like:

([0-9]{8})([0-9]{4})([0-9]{4})([0-9]{2})

Please see:
http://msdn.microsoft.com/en-us/library/system.text.regularexpressions.regex.aspx[^],
http://www.nncron.ru/help/EN/add_info/regexp.htm[^].

A more straightforward way would be using string.Substring four times, followed by string.Format("{0} {1} {2} {3}", arrayOfFourSubstrings).

Please see:
http://msdn.microsoft.com/en-us/library/aka44szs.aspx[^],
http://msdn.microsoft.com/en-us/library/b1csw23d.aspx[^].

—SA

You can use String.Substring() function
here is example

Dim myString As String = "123123452149856874"
Dim test1 As string = myString.Substring(1,8)
Dim test1 As string = myString.Substring(9,12)
Dim test1 As string = myString.Substring(13,16)
Dim test1 As string = myString.Substring(17,18)