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run code in 150+ php & hhvm versions
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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 4.3.11 - 5.6.28, 7.0.0 - 7.1.0
Warning: preg_replace(): Unknown modifier 'g' in /in/P34FR on line 5 NULL
Output for hhvm-3.10.0 - 3.13.2
Warning: Unknown modifier 'g': [/([0-9](er|éme|ème)/ig] in /in/P34FR on line 5 NULL
Output for 4.3.0 - 4.3.10
Warning: Unknown modifier 'g' in /in/P34FR on line 5 NULL