InStr vs .IndexOf

[Guest]

Let's say I want to find the occurance of SearchString in MyString, but I
want to search without regard to case ...

Which is better and why in VB.Net?

Index = Instr(MyString, SearchString) - 1

or

Index = MyString.ToUpper.IndexOf(SearchString.ToUpper)

 

[Herfried K. Wagner [MVP]]

Let's say I want to find the occurance of SearchString in MyString, but I
want to search without regard to case ...

Which is better and why in VB.Net?

Index = Instr(MyString, SearchString) - 1

or

Index = MyString.ToUpper.IndexOf(SearchString.ToUpper)

I prefer 'InStr(..., ..., CompareMethod.Text)'. By specifying the compare
mode, my code is "immune" against changes of 'Option Compare' on project or
file level.

 

[Guest]

What about the overhead added by having to .ToUpper both strings? Or is this
negligible?

InStr is still an excepted method in VB.NET, even tho it's from VB6?

 

[Herfried K. Wagner [MVP]]

What about the overhead added by having to .ToUpper both strings? Or is
this
negligible?

This depends on what you are doing. If you are comparing in an algorithm
that performs lots of iterations it may slow down your code, but the user
won't notice anything when you only compare one string to another when
he/she clicks a button, for example.

InStr is still an excepted method in VB.NET, even tho it's from VB6?

'InStr' is a VB.NET method that is neither deprecated nor obsolete.

 

[Guest]

Thanks!

This depends on what you are doing. If you are comparing in an algorithm
that performs lots of iterations it may slow down your code, but the user
won't notice anything when you only compare one string to another when
he/she clicks a button, for example.


'InStr' is a VB.NET method that is neither deprecated nor obsolete.

 

[Cor Ligthert]

PJ

I missed this question, which I almost standard answer with that with did a
test about it in this newsgroup in the year 2003.

Instr is faster than indexOf when it is about strings.
Instr is slower than indexOf when it is about characters.

I hope this gives some more information.

Cor