grep match email address - print only matched substring

grep_match_email

# Match email address from list of Name,Email , email can be with country code domain or company domain.

# List of names (file names.txt)
Cameron Carr    [email protected]
Tim Burgess [email protected]
Wanda   Dyer    [email protected]
Bella   Dowd    [email protected]
Madeleine   Mills   [email protected]

grep -Eo '(\w+\.)?\w+@\w+\.[a-z]{2,3}$' names.txt
[email protected]
[email protected]
[email protected]
[email protected]
[email protected]

The same but with sed
sed -n -r 's/.*\s((\w+\.)?\w+@\w+\.[a-z]{2,3}$)/\1/p'

.*\s((\w+\.)?\w+@\w+\.[a-z]{2,3}$) - will actually match the whole line in this case and be replaced by the submatch ((\w+\.)?\w+@\w+\.[a-z]{2,3}$) represented by the back reference: \1