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

[viktoras d.]

there is:

   if matchText(fld "fText", "\S") is false then
      answer "no text in field"
   end if

This one checks for any symbols that are not "whitespace" of any kind 
(\S is same as [ \t\f\r\n]).

Viktoras

Bob Sneidar wrote:
> 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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