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<?php $string = "Hello {replace this curley} {{but not this one}} {{{and not this one}}}"; $formatted = preg_replace('/(?!\{{2,})(\{{1})(\}{1})/'," ",$string); var_dump($formatted);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/ifXYV
function name:  (null)
number of ops:  11
compiled vars:  !0 = $string, !1 = $formatted
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, 'Hello+%7Breplace+this+curley%7D+%7B%7Bbut+not+this+one%7D%7D+%7B%7B%7Band+not+this+one%7D%7D%7D'
    5     1        INIT_FCALL                                               'preg_replace'
          2        SEND_VAL                                                 '%2F%28%3F%21%5C%7B%7B2%2C%7D%29%28%5C%7B%7B1%7D%29%28%5C%7D%7B1%7D%29%2F'
          3        SEND_VAL                                                 '+'
          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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