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<?php $string = "livraison 1er"; var_dump(preg_replace('/([0-9](er|éme|ème)/ig','$0<sup>$1</sup',$string));
Output for git.master, git.master_jit, rfc.property-hooks
Warning: preg_replace(): Unknown modifier 'g' in /in/P34FR on line 5 NULL

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