\@[a-z0-9\-\.]+ for the first pattern will also match the dot in
@alycianne. which looks like the end of the string.
In the second pattern that you tried
\@(([a-z0-9\-])+\.)+([a-z0-9])+ you are repeating the first group 1 or more times. That group ends on a dot, so to get a match, there should be at least a dot.
The second part of the group is also repeated 1 or more times, so there should also be at least a char a-z0-9 after the dot.
To get all 4 matches, you can make the first group optional using
Note that you don't have to escape the
\@ and that you can repeat the character class itself
[a-z0-9]+ instead of matching a single char in a capture group and then repeat the group.
$txt = "Testando se essa pescaria é valida @ju1lio.leao, se não for aciona @alycianne. Importante deixar @mirian ciente. E a @simone.akemi de sobreaviso."; $pattern = "/@(?:[a-z0-9-]+\.)*[a-z0-9]+/"; preg_match_all($pattern, $txt, $matches); print_r($matches);
Array (  => @ju1lio.leao  => @alycianne  => @mirian  => @simone.akemi )
You can use only one pattern:
$pattern = '/\@[a-z0-9-]+(?:\.?[a-z0-9-]+)/';
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