Regex VB.Net Regex.Replace

Question

I\'m trying to perform a simple regex find and replace, adding a tab into the string after some digits as outlined below.

From

a/users/12345/badges
         


        

Answer 1

You can achieve that with a mere look-ahead that will find the position right before the last /:

Dim s As String = Regex.Replace("a/users/12345/badges", "(?=/[^/]*$)", vbTab)

Output:

a/users/12345   /badges

See IDEONE demo

Or, you can just use LastIndexOf owith Insert:

Dim str2 As String
Dim str As String = "a/users/12345/badges"
Dim idx = str.LastIndexOf("/")
If idx > 0 Then
   str2 = str.Insert(idx, vbTab)
End If