Replace part of String, using regex and vb.net

Question

My application stores the path of the userdata.dll in a String.

I need to convert this string: C:\Applications\User\userdata.dll

into this: C:\\Applications\\User\\userdata.dll

All \ will need to be duplicated, independent on how many \ the path have.

Something like:

Dim defaultPath As String = "C:\Applications\User\userdata.dll"

' Regex
Dim r As Regex = New Regex( ... )

' This is the replacement string
Dim Replacement As String = " ... $1 ... "

' Replace the matched text in the InputText using the replacement pattern
Dim modifiedPath As String = r.Replace(defaultPath,Replacement)

Any help on this? I am trying to follow this question:

How to replace some part of this string with vb.net?

But cant find out how to make this Regex...

Why do you need a Regex? String.Replace works fine: https://dotnetfiddle.net/vTnpIi — Visual Vincent
– Visual Vincent, Commented May 29, 2016 at 10:35

rock321987 · Accepted Answer · 2016-05-29 11:34:09Z

2

You can use

Dim pattern As String =  "\\"

Dim rgx As New Regex(pattern)

Dim input As String = "C:\Applications\User\userdata.dll"

Dim result As String = rgx.Replace(input, "\\")

Console.WriteLine(result)

Ideone Demo

If you mean to say that replace any number of \ to \\, then you can use

Dim pattern As String =  "\\+"

Dim rgx As New Regex(pattern)

Dim input As String = "C:\\\\Applications\User\userdata.dll"

Dim result As String = rgx.Replace(input, "\\")

Ideone Demo

edited May 29, 2016 at 11:34

answered May 29, 2016 at 10:36

rock321987

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1 Comment

Steven Doggart Over a year ago

Nice answer, but technically, you don't need the character class. You could just use \\ as the pattern.

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