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<?php //echo preg_replace('/(?:(?!dog).)++/', '<$0>', 'where my dog is now?'); echo preg_replace('/(?!ba)..|(*SKIP)../', '<$0>', 'aabaabaaaaabbb');
Output for 5.3.4 - 7.1.0
<aa><ba><ab><aa><aa><ab><bb>
Output for 5.3.0 - 5.3.3

Process exited with code 137.