IsNumeric() returns crap

[snerting]

debug.print IsNumeric("KR00")
True
debug.print IsNumeric("KR75")
True
debug.print IsNumeric("9D44")
True


What!? Is it taking like hexadecimal numbers and currency into consideration or what the **** is it doing?

I just want to see if a string contains anything else than 0...9 Guess I have to write a little algorithm myself or use regex.

 

[1DMF]

well debug.print IsNumeric("KR00") = false when i run it and so does debug.print IsNumeric("KR75")

only debug.print IsNumeric("9D44") = true and i would have to assume because it is hexadecimal



"In complete darkness we are all the same, only our knowledge and wisdom separates us, don't let your eyes deceive you.

 

[Golom]

9D44" is (believe or not) a valid number because scientific notation has the form "nnEnn" or "nnDnn".

If you need to get around that then build yourself a Function like

Public Function myIsNumeric(ByVal Value As String) As Boolean
    
    myIsNumeric = False
    
    If IsNumeric(Value) Then
        If Not (Value Like "*[deDE]*") Then
            myIsNumeric = True
        End If
    End If
    
End Function

(With credit to gmmastros in thread222-1264749)

 

[snerting]

It seems like the "KR" ones are valid numbers as I'm from Norway (as I guessed in my initial post: currency). If I change my regional settings to United States it will state "False". But then it will claim that IsNumeric("1000$") is a valid number - which is False when I change back to Norwegian.

I will refrain from saying how I really feel about Visual Basic in this case, as it would not be suited for young people that might be reading on these forums.

 

[SkipVought]

Its a matter of understanding the programming language and application (VBA).

If, for instance, you enter 1/2 in Excel, what do you suppose will happen. If you understand, you can either avoid problems or leverage the features.

Answer:
[highlight white][white]1/2 is interpreted by Excel as a DATE. With USA regional settings it's Jan 2 of the CURRENT year.[/white][/highlight]

Skip,

_[red][/red]

 

[Golom]

And gmmastros just posted this clever trick on that other thread

IsNumeric ( SomeString & "E0" )

which gets returns FALSE when "SomeString" is "9D44" or "1000$".

 

[barny2006]

you can also use regexp with [0-9]. i have seen posting here. but i can't remember which post

 

[snerting]

Of course I can use regexp. I can use a lot of things to solve this pretty simple problem.

That's not the point.

I wouldn't say that the function text:
"IsNumeric returns True if the entire expression is recognized as a number; otherwise, it returns False."

..in any way states that what will be considered a number is depending on what my regional settings currently are set to, and that currency and for all I know lots of other stuff are taken into consideration.

I have seen lots of implementations of similar functions in other languages, but neither of them have dived into currency and other oddities.

In my opinion it's dirty, very dirty. I pretty much find IsNumeric useless now, unless I want to check one character only.

Surely Skip, you can say I should embrace the language and it's features, but I dont really think I will in this case. I find the behavior horrific and "dangerous" .

At least it would help if the function description actually said _something_ regarding localization etc. I bet I'm not the only one who has fallen into the pit of using this function and assuming letters wont be accepted.

When I first saw that "KR75" returned True, I made a joke about it being Norwegian currency. Kind of amusing that I was actually right.

 

[1DMF]

lol excellent - i'm off to Iceland end of this month they use KR as well, if I meet any programmers, I'll find out if they can use IsNumeric ;-)

"In complete darkness we are all the same, only our knowledge and wisdom separates us, don't let your eyes deceive you.