searching for strings with object.indexOf [resolved]

[nkad]

The method .indexOf is nice and all but it wont find strings that are of different case. Lest say I have a huge string buffer and need to search for a value but want it to be case-insensitive. Is there a built in method of VB.NET to do this?

E.g. Searching for the value 'red' should match values of 'Red', 'RED', rEd', within a string.

[<ABX]

Dim strSearchString as String = "text"
Dim strTextToSearch as String = "mY tExT"
 
'Just use the ToLower method of System.String to return a lower case instance of the search string and source string.
 
Msgbox (strTextToSearch.ToLower.IndexOf(strSearchString.ToLower))

I knew i should have included a case insensitve example.

[fret]

this one?

If TextBox1.Text.ToLower.IndexOf("red") <> -1 Then
            MessageBox.Show("found")
        Else
            MessageBox.Show("not found")
        End If

that method can search what ever the case of "red".

EDIT: sorry ABX for the crosspost

[<ABX]

Heres the case-insensitve version of the example in ur previous post:

Imports System.IO ' for StreamReader
 
'-----
 
Public Function SearchFile(FileName as String, SearchString as String) as Boolean
 
Dim sr as new StreamReader(FileName)
 
Dim strLines() as String = sr.ReadToEnd.ToLower.Split(vbcrlf)
 
sr.Close
sr = nothing
 
Dim intIndex as Integer '
 
For Each s as String in strLines
    intIndex = s.IndexOf(SearchString.ToLower)' IndexOf returns -1 if the string not found
    If not intIndex = -1 Then
       Return True
    End If
Next
 
End Function

[nkad]

Thanks though, at first I thought that M$ got rid of InStr() but I dbl checked and its still there so thats what I used. Not sure how fast it is compared to indexOf.