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<?php $re = '/^(?:.*/\.)(?:.*\.\.)(?:/)(?:.*//)(?:.*@\{)(?:@$)(?:.*\\)[^\000-\037\177 ~^:?*[]+/[^\000-\037\177 ~^:?*[]+(?<!\.lock)(?<!/)(?<!\.)$/'; var_dump(preg_match($re, ''));
based on 3tcRq
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/PqumE
function name:  (null)
number of ops:  9
compiled vars:  !0 = $re
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   3     0  E >   ASSIGN                                                   !0, '%2F%5E%28%3F%3A.%2A%2F%5C.%29%28%3F%3A.%2A%5C.%5C.%29%28%3F%3A%2F%29%28%3F%3A.%2A%2F%2F%29%28%3F%3A.%2A%40%5C%7B%29%28%3F%3A%40%24%29%28%3F%3A.%2A%5C%29%5B%5E%5C000-%5C037%5C177+%7E%5E%3A%3F%2A%5B%5D%2B%2F%5B%5E%5C000-%5C037%5C177+%7E%5E%3A%3F%2A%5B%5D%2B%28%3F%3C%21%5C.lock%29%28%3F%3C%21%2F%29%28%3F%3C%21%5C.%29%24%2F'
   5     1        INIT_FCALL                                               'var_dump'
         2        INIT_FCALL                                               'preg_match'
         3        SEND_VAR                                                 !0
         4        SEND_VAL                                                 ''
         5        DO_ICALL                                         $2      
         6        SEND_VAR                                                 $2
         7        DO_ICALL                                                 
         8      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 7.3.0