search for string in text file

[angela4eva]

Hi would appreciate if some one could help me with fatest way to search for a string "asf0798" in my text file data.dat and return a yes or no value(i.e the string exists or not..Some one please help with the fatest way to do this.
thanks

 

[JoeriMJ]

Dim oFile as System.IO.File
Dim oRead as System.IO.StreamReader
dim found as boolean
found = false
oRead = oFile.OpenText(“C:\data.dat”)
While oRead.Peek <> -1 or found
if instr(oRead.ReadLine(),"asf0789") <> 0 then
found = true
end if
End While

oRead.Close()

Something like this ?
Do not forget to close the streamreader !!!

 

[mmilan]

Read the file into a string and then use a RegEx (Regular expresion).

If you just have some files you need to check quickly (ie this is not part of an app you're trying to create) take a look at grep on unix boxes - versions are available (for free) on Windows.

mmilan.

 

[ThatRickGuy]

This works in the 2.0 framework:

if io.File.ReadAllText("C:\MyFile.dat").Contains("asf0798") then 
  msgbox("String found!")
else
  msgbox("String not found!")
end if

-Rick

VB.Net Forum forum796 forum855 ASP.NET Forum
I believe in killer coding ninja monkeys.

 

[JoeriMJ]

nice solution Rick, but i think it takes longer reading the whole file. This depends of course on the file size, but I see it this way. why read an entire textfile when the line could be found on rule 3.