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<?php //echo preg_replace('/(?:(?!dog).)++/', '<$0>', 'where my dog is now?'); echo preg_replace('/[^a]/','<$0>', 'бaabaabaaaaabbb');
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
<�><�>aa<b>aa<b>aaaaa<b><b><b>