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<?php var_dump(preg_replace('/aodjsoidjas','','tester'));
Output for 4.3.11 - 7.4.0
Warning: preg_replace(): No ending delimiter '/' found in /in/ULXiT on line 3 NULL
Output for 4.3.0 - 4.3.10
Warning: No ending delimiter '/' found in /in/ULXiT on line 3 NULL