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<?php $recipients = "john('john@yahoo.com'), frank('frank@gmail.com'),simon('simon@to.com')"; preg_match_all("/(?:, ?)?([^(]+)\('([^']+)'\)/", $recipients, $matches, PREG_SET_ORDER); var_export( array_map( fn($row) => ['name' => $row[1], 'email' => $row[2]], $matches ) );
Output for 8.0.1 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.25, 8.4.1 - 8.4.12
array ( 0 => array ( 'name' => 'john', 'email' => 'john@yahoo.com', ), 1 => array ( 'name' => 'frank', 'email' => 'frank@gmail.com', ), 2 => array ( 'name' => 'simon', 'email' => 'simon@to.com', ), )

preferences:
89.63 ms | 407 KiB | 5 Q