How to delimit / extract part of a string within 2 different strings.

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Hi I want to extract the first "word" which is actually a host name to parse into another method. I currently hard coded it. Is there anyway to soft code it to take data between "//" & "/". Using VB.NET thanks!.

VB

Dim s As String
Dim a As String
Dim f As String
For Each s In readText
    If s.Trim.StartsWith("#") Then
        SourceTextBox.Text = s.TrimStart("#")
        s = s.TrimStart("#")
        f = s.Substring(2)
        Dim j As Integer = f.IndexOf("/")
        a = f.Substring(0, j)
    End if

    If s.Trim.StartsWith("!") Then
        TargetTextBox.Text = s.TrimStart("!")
        s = s.TrimStart("!")
        f = s.Substring(2)
        Dim j As Integer = f.IndexOf("/")
        a = f.Substring(0, j)

    End If

This is the text file

#//ASUS-PC/Users/Username/Desktop/Rays
!//DELL-PC/Users/Username/Desktop/Advan

So my output is string "a" is
ASUS-PC
DELL-PC

But I want to soft-code it for better error checking. Since currently I hard-code it to count from the start of each line.

Posted 11-Oct-12 16:34pm

Member 9473758

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[no name] 11-Oct-12 22:48pm

Use split or a regular expression

Sergey Alexandrovich Kryukov 11-Oct-12 23:05pm

I answered using split, to avoid hard-coding often done in Regex expressions -- please see.
--SA

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Sergey Alexandrovich Kryukov · Answer 1 · 2012-10-11T17:03:00

It's this:

C#

static string ExtractComputerName(string fileName) {
   string[] parts = fileName.Split(
      new char[] { System.IO.Path.PathSeparator },
      System.StringSplitOptions.RemoveEmptyEntries);
   return parts[0]; 
}

Pay attention: even "\" was not hard-coded, thanks to System.IO.Path.PathSeparator.

Please see:
http://msdn.microsoft.com/en-us/library/system.io.path.pathseparator.aspx[^],
http://msdn.microsoft.com/en-us/library/system.string.split.aspx[^],
http://msdn.microsoft.com/en-us/library/ms131448.aspx[^],
http://msdn.microsoft.com/en-us/library/system.stringsplitoptions.aspx[^].

Next time, try to explore MSDN more thoroughly, to find all what can help you — it's not rocket surgery. :-)

—SA

Aarti Meswania · Answer 2 · 2012-10-11T18:52:00

try this,

VB

Dim Result As string=""
Dim str = "#//ASUS-PC/Users/Username/Desktop/Rays"
Dim doubleSlashInd = str.IndexOf("//") + 2
Dim FirstSingleSlashAfterDoubleInd = str.IndexOf("/", doubleSlashInd)
Result = str.Substring(doubleslashInd, FirstSingleSlashAfterDoubleInd - doubleslashInd)
'result= asus-pc   same way it will give result for dell-pc

Happy Coding!
:)

How to delimit / extract part of a string within 2 different strings.

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