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<?php print_t(preg_match('/^.*#([0-9]+)#$/', 'dfghdfghdfgh', $baseParentMessageId)); print_r($baseParentMessageId);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/GNTrb
function name:  (null)
number of ops:  12
compiled vars:  !0 = $baseParentMessageId
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   3     0  E >   INIT_FCALL_BY_NAME                                       'print_t'
         1        INIT_FCALL                                               'preg_match'
         2        SEND_VAL                                                 '%2F%5E.%2A%23%28%5B0-9%5D%2B%29%23%24%2F'
         3        SEND_VAL                                                 'dfghdfghdfgh'
         4        SEND_REF                                                 !0
         5        DO_ICALL                                         $1      
         6        SEND_VAR_NO_REF_EX                                       $1
         7        DO_FCALL                                      0          
   4     8        INIT_FCALL                                               'print_r'
         9        SEND_VAR                                                 !0
        10        DO_ICALL                                                 
        11      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 7.3.0