> 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

Pavel Stehule

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