(?:subpattern) by itself makes the parentheses non-capturing. But
(?letters:subpattern) sets GREP options that apply just to the subpattern
within the parentheses. (The alternative is (?letters) which sets GREP options
that apply to everything that comes after it in the pattern.)
The ?s option means, “Dot matches anything at all, including line breaks,” as
opposed to the default, which is that dot only matches regular characters.
Thus,(?s:subpattern) means that the subpattern can match across multiple lines.
Regards,
Neil Faiman
> On Sep 19, 2021, at 10:39 PM, Tim A <[email protected]
> <mailto:[email protected]>> wrote:
>
> Now I am trying to figure out what the ?s: colon business is in your
> solution (?<=^AAA\n)(?s:.*?)(?=^BBB$)
> pg 197 of manual for version 12.6.7
>
> These options can also be set using the clustering (non-capturing)
> parentheses syntax defined earlier, by inserting the option letters between
> the “?” and “:”.
>
> But if it is just to turn off capture then why does the match fail without
> the colon?
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