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<?php $str = 'áâãäąăāæåߧśšşçćčźżžýųűů'; var_export( preg_replace( '~.{8}\K(?!$)~u', "\n", $str ) );
Output for git.master, git.master_jit, rfc.property-hooks
'áâãäąăāæ åߧśšşçć čźżžýųűů'

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