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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 git.master_jit, git.master, rfc.property-hooks
array ( 0 => 'Adam-Smith', 1 => 'Christine', 2 => 'Roger', )

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