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<?php preg_match_all( '/^--(\d+)/', '[--1234] Subject', $matches); print_r($matches); // 1234
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/LDG6k
function name:  (null)
number of ops:  9
compiled vars:  !0 = $matches
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    2     0  E >   INIT_FCALL                                               'preg_match_all'
          1        SEND_VAL                                                 '%2F%5E--%28%5Cd%2B%29%2F'
          2        SEND_VAL                                                 '%5B--1234%5D+Subject'
          3        SEND_REF                                                 !0
          4        DO_ICALL                                                 
    3     5        INIT_FCALL                                               'print_r'
          6        SEND_VAR                                                 !0
          7        DO_ICALL                                                 
          8      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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