How to search specific string into text file from VB.NET

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Posted 18-Dec-11 22:38pm

sanjayv.gade

Updated 14-Jul-17 8:41am

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Amir Mahfoozi 19-Dec-11 5:21am

Some people are such experts that even with an empty question they have an answer to mention ! :)

3 solutions

Solution 1

You need StreamReader and Regx for that.

C#

//read file content in StreamReader
StreamReadertxt Reader = new StreamReader(fName);
szReadAll = txtReader.ReadToEnd();//Reads the whole text file to the end
txtReader.Close(); //Closes the text file after it is fully read.
txtReader = null;
//search word in file content
if (Regex.IsMatch(szReadAll, "SearchME", RegexOptions.IgnoreCase))//If the match is found in allRead
  MessageBox.Show("found");
else
  MessageBox.Show("not found");

Posted 18-Dec-11 22:48pm

koolprasad2003

Comments

OriginalGriff 19-Dec-11 4:51am

Using a regex is a bit of a big sledgehammer to crack a really quite small nut.
As is using a stream reader to fetch the data...

Solution 3

Why would you need Regex? All you need is a streamreader

Dim Findstring = IO.File.ReadAllText("Your File Path")
Dim Lookfor as string = "hello"

If FindString.Contains(Lookfor) then
Msgbox("Found: " & Lookfor)
end if

Although... Your method would be cleaner and probably better for future use.. You don't need Regex.

Posted 11-Feb-14 12:35pm

TazzyOpz

Updated 11-Feb-14 12:38pm

v3

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OriginalGriff · Accepted Answer · 2011-12-18T22:49:00

How you do this will depend on a number of factors: since you haven't tried to explain in any detail, I'll assume you know nothing, and just give you the basics.

The easiest way to do this is to read the text file into a single string, and then use the .NET framework to find the match:

VB

Dim text As String = File.ReadAllText("D:\Temp\MyFile.txt")
Dim index As Integer = text.IndexOf("hello")
If index >= 0 Then
   ' String is in file, starting at character "index"
End If

There are other ways, but that is pretty much the simplest.