RFR: 8305486: Add split() variants that keep the delimiters to String and j.u.r.Pattern [v2]

[Raffaello Giulietti]

On Tue, 11 Apr 2023 20:42:38 GMT, Roger Riggs <rriggs at openjdk.org> wrote:

>> The choice of multi-character delimiter is deliberate, to show that the regex really absorbs all the delimiter characters.
>> The `":+"` examples are followed by the `"o"` examples, where the delimiters are single characters.
>
> I understood the value of `:+` case.
> I found reading the single "o" as a delimiter is not intuitive or easy to parse because it looks like the the strings that are being delimited, not a delimiter.

The `"o"` examples are extended versions of the ones "inherited" from the existing `split(String,int)` variant.
I have no objections in replacing the examples with something else, but at some point there must be a less intuitive example to illustrate the full generality of the method.

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PR Review Comment: https://git.openjdk.org/jdk/pull/13305#discussion_r1163819102