On Thu, Apr 9, 2020 at 5:32 PM Yegappan Lakshmanan <[email protected]> wrote:
>
> Hi all,
>
> The submatch() function with a second argument set to 1, returns NULL
> when used outside of a :substitute command or the substitute() function.
> All the other functions that return a List, return an empty List on failure.
> But the submatch() function returns NULL on failure. e.g.
>
> call assert_equal([], submatch(0, 1))
> echo v:errors
>
> The returned value cannot be compared against NULL. I think the submatch()
> function should be changed to return an empty List.
>
> - Yegappan
submatch() is not meant to be used outside of a substitute, it's documented:
submatch({nr} [, {list}]) *submatch()* *E935*
Only for an expression in a |:substitute| command or
substitute() function.
IMHO when used outside if a :substitute command or of a substitute()
function, submatch() should generate an error. (What is the en_US text
of error E935?)
Best regards,
Tony.
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