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<?php $text = 'advcd<img loading="lazy" class="abcd pqr" alt="chi-phi-sinh-o-benh-v"ien-dai-hoc-y-duoc-co-so-2" attr="val"><img loading="lazy" class="abcd pqr" alt="abcd-sinh-o-benh-"ien-dai-hoc-y-duoc-co-so-3">sdfs'; preg_match_all('/(alt)=(".*?"(?=\s*(?:[^\s=]+="|>)))/i', $text, $matches); if (count($matches) > 1) { print_r($matches); }
Output for rfc.property-hooks, git.master, git.master_jit
Array ( [0] => Array ( [0] => alt="chi-phi-sinh-o-benh-v"ien-dai-hoc-y-duoc-co-so-2" [1] => alt="abcd-sinh-o-benh-"ien-dai-hoc-y-duoc-co-so-3" ) [1] => Array ( [0] => alt [1] => alt ) [2] => Array ( [0] => "chi-phi-sinh-o-benh-v"ien-dai-hoc-y-duoc-co-so-2" [1] => "abcd-sinh-o-benh-"ien-dai-hoc-y-duoc-co-so-3" ) )

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