How to test if a field does not contain anything else than returns or tab ?

[Bob Sneidar]

I wonder, isn't there a way to use regular expressions to check for  
white space?

Bob Sneidar
IT Manager
Logos Management
Calvary Chapel CM

On Feb 3, 2009, at 6:18 AM, Andre.Bisseret wrote:

> Bonjour,
>
> I need to test if a given list field in a stack contains some values
> or if it is empty.
> Well, by "empty" I mean that the field contains not any word or
> number. But it happens that it may include carriage returns and/or  
> tabs.
> In such cases :
> field "thisField" is empty
> return false.
>
> If there were only carriage returns, I could test if each line of the
> field is empty;
> indeed :
> line x of fld "thisField" is empty
> returns true if the only character in the line is cr
> but returns false if there is at least one tab in the line.
>
> I just tried :
> if last char of fld "thisField" is empty  ;-))
>
> that seems working well ! but a bit strange and might be not  
> reliable ?
>
> Is there a better trick ?
>
> Thanks for any idea
>
> Best regards from Grenoble
> André
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