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<?php echo preg_replace('/([a-z])(_[a-z])/', function($a) { var_dump($a);}, 'rob_tr_yuui');
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught TypeError: preg_replace(): Argument #2 ($replacement) must be of type array|string, Closure given in /in/OXpeT:3 Stack trace: #0 /in/OXpeT(3): preg_replace('/([a-z])(_[a-z]...', Object(Closure), 'rob_tr_yuui') #1 {main} thrown in /in/OXpeT on line 3
Process exited with code 255.

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