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<?php $match = preg_replace('/(?<=^|[\x09\x20\x2D])./e', 'strtoupper("\0")', "Test test1"); var_dump($match);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/IhliS
function name:  (null)
number of ops:  10
compiled vars:  !0 = $match
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   INIT_FCALL                                               'preg_replace'
          1        SEND_VAL                                                 '%2F%28%3F%3C%3D%5E%7C%5B%5Cx09%5Cx20%5Cx2D%5D%29.%2Fe'
          2        SEND_VAL                                                 'strtoupper%28%22%5C0%22%29'
          3        SEND_VAL                                                 'Test+test1'
          4        DO_ICALL                                         $1      
          5        ASSIGN                                                   !0, $1
    4     6        INIT_FCALL                                               'var_dump'
          7        SEND_VAR                                                 !0
          8        DO_ICALL                                                 
          9      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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