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<?php //echo preg_replace('/(?:(?!dog).)++/', '<$0>', 'where my dog is now?'); echo preg_replace('/(*SKIP)(?!ba)../', '<$0>', 'aabaabaaaaabbb');
Output for 5.3.4 - 7.1.0
<aa>b<aa>b<aa><aa><ab><bb>
Output for 4.4.9, 5.2.5 - 5.3.3

Process exited with code 137.
Output for 4.3.11 - 4.4.8, 5.0.0 - 5.2.4
Warning: preg_replace(): Compilation failed: nothing to repeat at offset 1 in /in/AWfap on line 3
Output for 4.3.0 - 4.3.10
Warning: Compilation failed: nothing to repeat at offset 1 in /in/AWfap on line 3