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<?php $txt="Неё, в этом дело. Но удержать такого запала, правда?"; var_dump(preg_match_all("~((^|\s|\W|\D)не(\W|\D))~Uiu", $txt, $out)); var_dump( $out );
Output for git.master, git.master_jit, rfc.property-hooks
int(1) array(4) { [0]=> array(1) { [0]=> string(6) "Неё" } [1]=> array(1) { [0]=> string(6) "Неё" } [2]=> array(1) { [0]=> string(0) "" } [3]=> array(1) { [0]=> string(2) "ё" } }

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