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<?php $tags = "Adam-Smith, Christine, Müller, Roger, Hauptstraße, X Æ A-12"; var_export( preg_split( '/ *, *|[^,]*[^, a-z\d()\-+&%@#][^,]*/i', $tags, 0, PREG_SPLIT_NO_EMPTY ) );
Output for 7.4.0 - 7.4.33, 8.0.1 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3
array ( 0 => 'Adam-Smith', 1 => 'Christine', 2 => 'Roger', )
preferences:
104.18 ms | 1244 KiB | 4 Q