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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:  5
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        FRAMELESS_ICALL_3                preg_replace        ~2      '%7E%5Cbtest1%3D%22%5B%5E%22%5Cs%5D%2A%5CK%5B%5E%22%5D%2B%7E', ''
          2        OP_DATA                                                      !0
          3        ECHO                                                         ~2
          4      > RETURN                                                       1

Generated using Vulcan Logic Dumper, using php 8.5.0


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