case sensative

i'm currently writing a search program code on vb.net, is there anyway i can make it so that my searchwords are NOT case sensative?

ex: searchword "error" would return results such as "ERROR" "ErRor" "error" "eRRoR" etc.

anyhelp would be greatly appreciated

I would change the case of the string you are searching to match the case of the string you are searching with.

VB Code:

Dim sError As String = "This is an ErrOr"
Dim sSearch As String = "Error"
If sError.ToLower().IndexOf(sSearch.ToLower()) > -1 Then
    MessageBox.Show("Found it!")
End If

well its a little more complicated than that... see i need to essentially enter random text documents looking for these words so changing the words in the documents i'm searching through probably won't be possible, is there any other alternative? BTW thanks for the suggestion.

it isn't necessary to change the text of the documents. In order to read the documents, you would have to open them into a streamreader anyway, just assign the contents to a variable and then compare the string in the variable with your search value.

If you find it do what you need to do with the rest of the contents of the document.

hey... thats not a bad idea... sorry cyberhawk, i misunderstood you the first time. Thanks!

Well, use RegularExpressions as they are dead more fast

Absolutely, I was going to send a follow-up message once I got home, but you beat me to it.

Quote:

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Originally posted by PT Exorcist
Well, use RegularExpressions as they are dead more fast

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Hi,

He is a new guy and you want him to use REGEX?????:eek: That's like putting a 14 year old into an Indy.

Yeah, but if he makes that first lap... ;)

Well, if you decide not to go with RegEX, use the the Compare method of the String class.

VB Code:

If String.Compare("hi", "Hi", True) = 0 Then Messagebox.Show("Equal")

actually, that was where we started before we started talking about REGEX.

Quote:

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Originally posted by taxes
That's like putting a 14 year old into an Indy.

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We already have 14 year olds in the Indies. Same goddamn rednecks winning every time. :rolleyes:

Quote:

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Originally posted by mendhak
We already have 14 year olds in the Indies. Same goddamn rednecks winning every time. :rolleyes:

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I thought the last Indy Redneck to win was Nigel Mansell.

One up for the UK (BUt only one I'm afraid:sick: )

Quote:

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Originally posted by mendhak
We already have 14 year olds in the Indies. Same goddamn rednecks winning every time. :rolleyes:

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geez, i hate rednecks!!! lol=))

Why all of this ?

VB.Net offers a compilation option: Option Compare, this option controls the behavior of the program when comparing string values, there are 2 options: Option Compare Binary which forces the strings to be in the same case for true equationing, Option Compare Text which compares the text by their characters ignorign the case - and that is the optino you want.

To use option include the statement in the top of the file preceeding any declaration (before the "Imports" statement also).

Examples:

VB Code:

Option Compare Binary
...
Dim Rs As Boolean
If "AaBbCc" = "aabbcc" Then
Rs = True 'Rs is still False
End If

VB Code:

Option Compare Text
...
Dim Rs As Boolean
If "AaBbCc" = "aabbcc" Then
Rs = True 'Rs is True now
End If

Quote:

---

Originally posted by TLord
Why all of this ?

VB.Net offers a compilation option: Option Compare, this option controls the behavior of the program when comparing string values, there are 2 options: Option Compare Binary which forces the strings to be in the same case for true equationing, Option Compare Text which compares the text by their characters ignorign the case - and that is the optino you want.

To use option include the statement in the top of the file preceeding any declaration (before the "Imports" statement also).

Examples:

VB Code:

Option Compare Binary
...
Dim Rs As Boolean
If "AaBbCc" = "aabbcc" Then
Rs = True 'Rs is still False
End If

VB Code:

Option Compare Text
...
Dim Rs As Boolean
If "AaBbCc" = "aabbcc" Then
Rs = True 'Rs is True now
End If

---

Option Compare has to do with how your source code compatibility is maintained, not how strings are compared.

If what you are saying were true, then why would Microsoft invest the effort they have into REGEX.

This kind of advice should be thoroughly researched before being offered.

Oops, my bad, I had something else on my mind, TLord is correct, I didn't pay close enough attention to what I was reading.

My appoligies TLord:blush:

Quote:

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Originally posted by CyberHawke
My appoligies TLord:blush:

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No need to apologise :D It's always nice to help:thumb:

Quote:

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Originally posted by CyberHawke
Oops, my bad, I had something else on my mind, TLord is correct, I didn't pay close enough attention to what I was reading.

My appoligies TLord:blush:

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Yes, you must not try to put too much into such a tiny space:D