You could also use matchChunk with a regular expression that excludes the tab 
character.

Sent from my iPhone

> On Jan 21, 2021, at 7:14 AM, Keith Clarke via use-livecode 
> <use-livecode@lists.runrev.com> wrote:
> 
> Ah yes indeed, I’d forgotten I could test with 'put not(tab)’ in the message 
> box - that certainly proves the syntax was wrong! :-)
> Best,
> Keith
> 
>>> On 21 Jan 2021, at 10:49, Dick Kriesel via use-livecode 
>>> <use-livecode@lists.runrev.com> wrote:
>>> 
>>> 
>>> 
>>>> On Jan 21, 2021, at 2:34 AM, Keith Clarke via use-livecode 
>>>> <use-livecode@lists.runrev.com> wrote:
>>> 
>>> I was just keen to understand why offset wasn’t happy with the ‘not(tab)’ 
>>> in this instance.
>> 
>> expression "not(tab)" evaluates to true, which doesn’t serve your purpose
>> 
>> — Dick
>> 
>> 
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