<?php $str = "Faktura č.: XYZ za období 01/2017"; preg_match("~^\\s*Faktura\\s+č.:\\s*(?P<invoice>\S+)(?:\\s+za\\s+období\\s+0?(?P<month>\\d{1,2})\\s*/\\s*(?P<year>\\d{4}))?\\s*$~iu", $str, $matches); var_dump($matches);
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