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<?php $a = '2015/09/09'; print rge_replace('([0-9]+)/([0-9]+)/([0-9]+)','\\2/\\3/\\1',$a);
based on ssQna
Output for 7.0.0 - 7.2.0
Fatal error: Uncaught Error: Call to undefined function rge_replace() in /in/HUjqI:3 Stack trace: #0 {main} thrown in /in/HUjqI on line 3
Process exited with code 255.
Output for 5.3.17 - 5.6.28
Fatal error: Call to undefined function rge_replace() in /in/HUjqI on line 3
Process exited with code 255.