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<?php preg_match('/([a-z]+)(<((?R)(,(?R))*)>)?/', 'a<b<c<d>>,g>', $matches, PREG_OFFSET_CAPTURE, 2); print_r($matches);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/ljsjs
function name:  (null)
number of ops:  11
compiled vars:  !0 = $matches
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   INIT_FCALL                                               'preg_match'
          1        SEND_VAL                                                 '%2F%28%5Ba-z%5D%2B%29%28%3C%28%28%3FR%29%28%2C%28%3FR%29%29%2A%29%3E%29%3F%2F'
          2        SEND_VAL                                                 'a%3Cb%3Cc%3Cd%3E%3E%2Cg%3E'
          3        SEND_REF                                                 !0
          4        SEND_VAL                                                 256
          5        SEND_VAL                                                 2
          6        DO_ICALL                                                 
    5     7        INIT_FCALL                                               'print_r'
          8        SEND_VAR                                                 !0
          9        DO_ICALL                                                 
         10      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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