[ic] '!~' and 'rn' are not equivalent

[David Christensen]

On Mar 10, 2010, at 1:35 PM, Grant wrote:

>>> Since they have identical definitions under mv_column_op here:
>>>
>>> http://www.icdevgroup.org/interchange-doc-5.2.0/frames/icdatabase_38.html
>>>
>>> I was under the impression that '!~' and 'rn' were equivalent
>>> operators.  After some testing I see that they are not.  Can anyone
>>> tell me what is the difference between them?
>>
>>
>> Looks like the difference is that `rn` is case-sensitive, while '! 
>> ~' is not.
>
> Not from what I'm seeing.  I get true from the following:
>
> [if type=explicit compare="'456 789' !~ '123'"]
>        true
> [else]
>        false
> [/else]
> [/if]
>
> and false from the following:
>
> [if type=explicit compare="'456 789' rn '123'"]
>        true
> [else]
>        false
> [/else]
> [/if]


The "explicit" type of the [if] block expects perl code in the compare  
argument; the first is syntactically valid perl, the second is not  
(there's a "!~" operator, but no "rn"), and so fails (there may be a  
message in the logs about it, but I wouldn't be surprised if it was a  
silent failure).

Regards,

David
--
David Christensen
End Point Corporation
david at endpoint.com