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<?php $val = 'dolphin-'; preg_match( $val, '[#1234] Subject', $matches); echo $matches[1]; // 1234
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/pkDFe
function name:  (null)
number of ops:  9
compiled vars:  !0 = $val, !1 = $matches
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    2     0  E >   ASSIGN                                                   !0, 'dolphin-'
    3     1        INIT_FCALL                                               'preg_match'
          2        SEND_VAR                                                 !0
          3        SEND_VAL                                                 '%5B%231234%5D+Subject'
          4        SEND_REF                                                 !1
          5        DO_ICALL                                                 
    4     6        FETCH_DIM_R                                      ~4      !1, 1
          7        ECHO                                                     ~4
          8      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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