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<?php preg_replace("/\[img:[a-zA-Z/]+\]/", 'Imagem: [img:enem/2013/enun/2013-1-1-1.0.jpg] ', 'aa'); ?>
Output for 4.3.11 - 7.2.0
Warning: preg_replace(): Unknown modifier ']' in /in/LsiqX on line 3
Output for 4.3.0 - 4.3.10
Warning: Unknown modifier ']' in /in/LsiqX on line 3