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<?php $re = '/^(\S+)\h+\[\S*\](?!\S).*$(?![\s\S]*^\1)/m'; $str = 'green [foo] [foo1] red [foo] blue [foo] [foo1] [foo2] yellow [foo2] green [foo] green [foo] [foo1] red [foo] pink [foo3]'; preg_match_all($re, $str, $matches); print_r($matches[0]);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/K9Xln
function name:  (null)
number of ops:  12
compiled vars:  !0 = $re, !1 = $str, !2 = $matches
line      #* E I O op                               fetch          ext  return  operands
-----------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                       !0, '%2F%5E%28%5CS%2B%29%5Ch%2B%5C%5B%5CS%2A%5C%5D%28%3F%21%5CS%29.%2A%24%28%3F%21%5B%5Cs%5CS%5D%2A%5E%5C1%29%2Fm'
    4     1        ASSIGN                                                       !1, 'green++++++++++%5Bfoo%5D+%5Bfoo1%5D%0Ared+++++++++++++%5Bfoo%5D%0Ablue++++++++++++++++++%5Bfoo%5D+%5Bfoo1%5D+%5Bfoo2%5D%0Ayellow+++++++++++++%5Bfoo2%5D%0Agreen++++++++++%5Bfoo%5D%0Agreen++++++++++%5Bfoo%5D+%5Bfoo1%5D%0Ared+++++++++++++%5Bfoo%5D%0Apink++++++++++++++++++%5Bfoo3%5D'
   13     2        INIT_FCALL                                                   'preg_match_all'
          3        SEND_VAR                                                     !0
          4        SEND_VAR                                                     !1
          5        SEND_REF                                                     !2
          6        DO_ICALL                                                     
   14     7        INIT_FCALL                                                   'print_r'
          8        FETCH_DIM_R                                          ~6      !2, 0
          9        SEND_VAL                                                     ~6
         10        DO_ICALL                                                     
         11      > RETURN                                                       1

Generated using Vulcan Logic Dumper, using php 8.5.0


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