Make sure split(regex) returns an array of strings

[pmario]

This PR makes sure split(regex) used by the splitregexp operator returns an array of strings. It fixes: #8216 and #8213

Code to test with

\define re() (color)|(colour)ed
\define str() Something coloured
{{{ [<str>splitregexp<re>join[, ]] }}}

---

{{{ [<str>splitregexp<re>] }}}

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[pmario]

@Jermolene -- Please confirm that the following code should create the output as shown in the screenshtot.

\define re() (color)|(colour)ed
\define str() Something coloured
{{{ [<str>splitregexp<re>join[, ]] }}}

---

{{{ [<str>splitregexp<re>] }}}

[Jermolene]

Hi @pmario the issue here is that the JS split operator is essentially useless when used with a regex that includes capture groups.

So, I think the best we can do is coerce undefined to an empty string, and add a warning to the docs for the split operator explaining why it should not be used with capture groups.

[pmario]

So, I think the best we can do is coerce undefined to an empty string, and add a warning to the docs for the split operator explaining why it should not be used with capture groups.

OK - I'll some info to the docs too.

[pmario]

@Jermolene -- This should work as requested now + a bit more docs

[Jermolene]

Thank you @pmario