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<?php $str = 'hi test1="12c4 ab3d" blablabla test1="abcd 3456 sdfs 2435"'; echo preg_replace('~\btest1="[^"\s]*\K[^"]+~', '', $str);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/MnZfY
function name:  (null)
number of ops:  8
compiled vars:  !0 = $str
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, 'hi+test1%3D%2212c4+ab3d%22+blablabla+test1%3D%22abcd+3456+sdfs+2435%22'
    4     1        INIT_FCALL                                               'preg_replace'
          2        SEND_VAL                                                 '%7E%5Cbtest1%3D%22%5B%5E%22%5Cs%5D%2A%5CK%5B%5E%22%5D%2B%7E'
          3        SEND_VAL                                                 ''
          4        SEND_VAR                                                 !0
          5        DO_ICALL                                         $2      
          6        ECHO                                                     $2
          7      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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