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<?php $target = 'https://example.com/[photo-s]/photo.jpg'; $result = preg_replace('/\[photo-[a-z]+]/', 'somethingElse', $target); var_dump($result);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/0aKDS
function name:  (null)
number of ops:  11
compiled vars:  !0 = $target, !1 = $result
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, 'https%3A%2F%2Fexample.com%2F%5Bphoto-s%5D%2Fphoto.jpg'
    5     1        INIT_FCALL                                               'preg_replace'
          2        SEND_VAL                                                 '%2F%5C%5Bphoto-%5Ba-z%5D%2B%5D%2F'
          3        SEND_VAL                                                 'somethingElse'
          4        SEND_VAR                                                 !0
          5        DO_ICALL                                         $3      
          6        ASSIGN                                                   !1, $3
    7     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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