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<?php $str = "Faktura č.: XYZ"; preg_match("~^\\s*Faktura\\s+č.:\\s*(?P<invoice>\S+)(?:\\s+za\\s+období\\s+0?(?P<month>\\d{1,2})\\s*/\\s*(?P<year>\\d{4}))?\\s*$~iu", $str, $matches); var_dump($matches);
Output for git.master, git.master_jit, rfc.property-hooks
array(3) { [0]=> string(16) "Faktura č.: XYZ" ["invoice"]=> string(3) "XYZ" [1]=> string(3) "XYZ" }

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