Thanks to both *Kaveh*, and *Fletcher* for their replies.

The following works near-perfectly for me:
(?-i)(?<=\b)([A-Z]{2,})(?=\b)

It's safely saved for future use/reference too! Thanks again!
Andy
On Tuesday, 13 June 2023 at 19:07:22 UTC+1 Kaveh Bazargan wrote:

> So any single cap letter leave as is? will that work? What will help is if 
> you give a few examples, or put all the words that did not work so I can 
> test it.
>
> On Tue, 13 Jun 2023 at 17:32, 'Andy Nickless' via BBEdit Talk <
> [email protected]> wrote:
>
>> Hello Kaveh,
>> It’s an ongoing project, so if you can improve it, that would be very 
>> useful.
>> Best wishes,
>> Andy
>>
>>
>> On 13 Jun 2023, at 15:21, Kaveh Bazargan <[email protected]> wrote:
>>
>> I can look again if it helps. is the job done or useful to have these 
>> enhancements added too?
>>
>> On Tue, 13 Jun 2023 at 14:40, 'Andy Nickless' via BBEdit Talk <
>> [email protected]> wrote:
>>
>>> Thanks once again, Kaveh.
>>>
>>> I tried the search:  \b([A-Z]+)\b
>>> and replace: \L\1
>>> It left two word spaces before the lowercase word.
>>>
>>> When I changed the search to:  ([A-Z]+) with word spaces before and 
>>> after, it did a great job as long as I used the Replace & Find button, but 
>>> it had one or two quirks. For instance, if you had consecutive uppercase 
>>> words, it would only find alternate ones.
>>> Also, it didn't find capitalised words with commas, full-stops 
>>> exclamation marks or question marks. That would be useful.
>>> Lastly, it also found the word I (capitalised, of course) which I didn't 
>>> want it to.
>>>
>>> I hope I'm not being too greedy!
>>> Thanks so much for your help so far, it's saved me quite a lot of time.
>>>
>>> On Tuesday, 13 June 2023 at 13:42:14 UTC+1 Kaveh Bazargan wrote:
>>>
>>>> Try this:
>>>>
>>>> search: \b([A-Z]+)\b
>>>> replace: \L\1
>>>>
>>>> case sensitive
>>>>
>>>> On Tue, 13 Jun 2023 at 13:25, 'Andy Nickless' via BBEdit Talk <
>>>> [email protected]> wrote:
>>>>
>>>>> I have some text with random uppercase words (for emphasis) and I want 
>>>>> BBEdit to find them and replace them with lower case words.
>>>>> I ONLY want to change words in which ALL the letters are uppercase - 
>>>>> in other words, leave the capital letters at the beginning of sentences 
>>>>> and 
>>>>> names etc.
>>>>>
>>>>> As an example, if my sentence is:
>>>>> The BIG CAT called George, sat on the DARK BROWN mat.
>>>>>
>>>>> I would like it to look like this:
>>>>> The big cat called George, sat on the dark brown mat.
>>>>>
>>>>> Any help with this will be greatly appreciated.
>>>>> Andy
>>>>>
>>>>> -- 
>>>>> This is the BBEdit Talk public discussion group. If you have a feature 
>>>>> request or need technical support, please email "[email protected]" 
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>>>>>  
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>>>>> .
>>>>>
>>>>
>>>>
>>>> -- 
>>>> Kaveh Bazargan PhD
>>>> Director
>>>> River Valley Technologies <http://rivervalley.io/> ● Twitter 
>>>> <https://twitter.com/rivervalley1000> ● LinkedIn 
>>>> <https://www.linkedin.com/in/bazargankaveh/> ● ORCID 
>>>> <https://orcid.org/0000-0002-1414-9098> ● @[email protected] 
>>>> <https://mastodon.social/@kaveh1000>
>>>> *Accelerating the Communication of Research*
>>>>
>>>> * 
>>>> <https://www.linkedin.com/posts/bazargankaveh_ismte-innovation-award-recipient-kaveh-bazargan-activity-7039348552526921728-XAEB/?utm_source=share&utm_medium=member_desktop>
>>>>   [image: 
>>>> https://rivervalley.io/gigabyte-wins-the-alpsp-scholarly-publishing-innovation-award-using-river-valleys-publishing-technology/]
>>>>  
>>>> <https://rivervalley.io/gigabyte-wins-the-alpsp-scholarly-publishing-innovation-award-using-river-valleys-publishing-technology/>*
>>>>
>>>
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>>> .
>>>
>>
>>
>> -- 
>> Kaveh Bazargan PhD
>> Director
>> River Valley Technologies <http://rivervalley.io/> ● Twitter 
>> <https://twitter.com/rivervalley1000> ● LinkedIn 
>> <https://www.linkedin.com/in/bazargankaveh/> ● ORCID 
>> <https://orcid.org/0000-0002-1414-9098> ● @[email protected] 
>> <https://mastodon.social/@kaveh1000>
>> *Accelerating the Communication of Research*
>>
>> * 
>> <https://www.linkedin.com/posts/bazargankaveh_ismte-innovation-award-recipient-kaveh-bazargan-activity-7039348552526921728-XAEB/?utm_source=share&utm_medium=member_desktop>
>>   [image: 
>> https://rivervalley.io/gigabyte-wins-the-alpsp-scholarly-publishing-innovation-award-using-river-valleys-publishing-technology/]
>>  
>> <https://rivervalley.io/gigabyte-wins-the-alpsp-scholarly-publishing-innovation-award-using-river-valleys-publishing-technology/>*
>>
>> -- 
>> This is the BBEdit Talk public discussion group. If you have a feature 
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>> .
>>
>>
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> To view this discussion on the web visit 
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>>  
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>> .
>>
>
>
> -- 
> Kaveh Bazargan PhD
> Director
> River Valley Technologies <http://rivervalley.io> ● Twitter 
> <https://twitter.com/rivervalley1000> ● LinkedIn 
> <https://www.linkedin.com/in/bazargankaveh/> ● ORCID 
> <https://orcid.org/0000-0002-1414-9098> ● @[email protected] 
> <https://mastodon.social/@kaveh1000>
> *Accelerating the Communication of Research*
>
> * 
> <https://www.linkedin.com/posts/bazargankaveh_ismte-innovation-award-recipient-kaveh-bazargan-activity-7039348552526921728-XAEB/?utm_source=share&utm_medium=member_desktop>
>   [image: 
> https://rivervalley.io/gigabyte-wins-the-alpsp-scholarly-publishing-innovation-award-using-river-valleys-publishing-technology/]
>  
> <https://rivervalley.io/gigabyte-wins-the-alpsp-scholarly-publishing-innovation-award-using-river-valleys-publishing-technology/>*
>

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