I wrote the following command
echo -en 'uno\ndue\n' | sed -E 's/^.*(uno|$)/\1/'
expecting the following output
uno
This is indeed the case with my GNU Sed 4.8.
However, I've verified that BSD Sed outputs
Why is that the case?
Explanation of difference between GNU sed and BSD sed
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I'd say that BSD's sed is POSIX-compatible only. POSIX specifies support only for basic regular expressions, which have many limitations (e.g., no support for | (alternation) at all, no direct support for + and ?) and different escaping requirements.
BSD sed is default one on MacOS so very first thing on a new system is to get GNU-compatible sed:
brew install gsed.