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<?php $text = '"The $girl$ is a $good$ person"'; echo preg_replace('/(?<!\S)\$[^$]+\$(?!\S)/', '$$0$', $text);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/hEnkpe
function name:  (null)
number of ops:  5
compiled vars:  !0 = $text
line      #* E I O op                               fetch          ext  return  operands
-----------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                       !0, '%22The+%24girl%24+is+a+%24good%24+person%22'
    4     1        FRAMELESS_ICALL_3                preg_replace        ~2      '%2F%28%3F%3C%21%5CS%29%5C%24%5B%5E%24%5D%2B%5C%24%28%3F%21%5CS%29%2F', '%24%240%24'
          2        OP_DATA                                                      !0
          3        ECHO                                                         ~2
          4      > RETURN                                                       1

Generated using Vulcan Logic Dumper, using php 8.5.0


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