Re: regexp_matches and regexp_split are inconsistent

>
> If you count carefully, you will see that regexp_matches() reports a
> match of the pattern at the start of the string and at the end of the
> string, and also just before 'c' (after the match to the single space).
> However, regexp_split() disregards these "degenerate" matches of the
> same pattern.
>
> Is this what we want? Arguably regexp_split is doing the most
> reasonable thing for its intended usage, but the strict definition of
> regexp matching seems to require what regexp_matches does. I think
> we need to either change one function to match the other, or else
> document the inconsistency.
>

Regexp_matches behave is correct, but less usable. I thing space from
virtual begin to first char and from last char to virtual end can be
eliminated.

Regards
Pavel Stehule