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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 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.26, 7.3.0 - 7.3.13, 7.4.0 - 7.4.1, 8.1.24 - 8.1.28, 8.2.11 - 8.2.18, 8.3.0 - 8.3.6
<aa>b<aa>b<aa><aa><ab><bb>
Output for 4.4.9, 5.2.5 - 5.2.17, 5.3.0 - 5.3.3

Process exited with code 137.
Output for 4.3.11, 4.4.0 - 4.4.8, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 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
preferences:
221.81 ms | 401 KiB | 345 Q