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<?php preg_match('/a-z/', 'Hello', $match); var_dump($match);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/CkXoB
function name:  (null)
number of ops:  9
compiled vars:  !0 = $match
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   4     0  E >   INIT_FCALL                                               'preg_match'
         1        SEND_VAL                                                 '%2Fa-z%2F'
         2        SEND_VAL                                                 'Hello'
         3        SEND_REF                                                 !0
         4        DO_ICALL                                                 
   7     5        INIT_FCALL                                               'var_dump'
         6        SEND_VAR                                                 !0
         7        DO_ICALL                                                 
         8      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 7.3.0