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<?php //if -behind- have double or more (\\) match it, but if (\) its one ignore it //get -behind\\- $str = 'hey look -behind\\- you'; //ignore -behind\- $str = 'hey look -behind\- you'; preg_match_all('/\-(.*?)(?<!\\\{2})\-/', $str, $matched); var_dump($matched);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/q9dee
function name:  (null)
number of ops:  11
compiled vars:  !0 = $str, !1 = $matched
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    6     0  E >   ASSIGN                                                   !0, 'hey+look+-behind%5C-+you'
    8     1        ASSIGN                                                   !0, 'hey+look+-behind%5C-+you'
   10     2        INIT_FCALL                                               'preg_match_all'
          3        SEND_VAL                                                 '%2F%5C-%28.%2A%3F%29%28%3F%3C%21%5C%5C%7B2%7D%29%5C-%2F'
          4        SEND_VAR                                                 !0
          5        SEND_REF                                                 !1
          6        DO_ICALL                                                 
   12     7        INIT_FCALL                                               'var_dump'
          8        SEND_VAR                                                 !1
          9        DO_ICALL                                                 
         10      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0

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