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<?php $pattern = '~\{(.*?)\}~'; $string = '{3}+{2}-{1}'; preg_match_all($pattern, $string, $matches); print_r($matches[1]); // 1234
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/5FdN1
function name:  (null)
number of ops:  12
compiled vars:  !0 = $pattern, !1 = $string, !2 = $matches
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    2     0  E >   ASSIGN                                                   !0, '%7E%5C%7B%28.%2A%3F%29%5C%7D%7E'
    3     1        ASSIGN                                                   !1, '%7B3%7D%2B%7B2%7D-%7B1%7D'
    4     2        INIT_FCALL                                               'preg_match_all'
          3        SEND_VAR                                                 !0
          4        SEND_VAR                                                 !1
          5        SEND_REF                                                 !2
          6        DO_ICALL                                                 
    5     7        INIT_FCALL                                               'print_r'
          8        FETCH_DIM_R                                      ~6      !2, 1
          9        SEND_VAL                                                 ~6
         10        DO_ICALL                                                 
         11      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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