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<?php var_dump(preg_match("/[^purchase]_total_amount/", "hoge_total"));
based on X7dbt
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/Er3UO
function name:  (null)
number of ops:  8
compiled vars:  none
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   3     0  E >   INIT_FCALL                                               'var_dump'
         1        INIT_FCALL                                               'preg_match'
         2        SEND_VAL                                                 '%2F%5B%5Epurchase%5D_total_amount%2F'
         3        SEND_VAL                                                 'hoge_total'
         4        DO_ICALL                                         $0      
         5        SEND_VAR                                                 $0
         6        DO_ICALL                                                 
         7      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 7.4.0