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<?php $texto = "this string should not match the regex"; preg_match_all("~{([^\d\W]\w*)\}~", $texto, $matches); var_dump($matches);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/EY5X9
function name:  (null)
number of ops:  10
compiled vars:  !0 = $texto, !1 = $matches
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, 'this+string+should+not+match+the+regex'
    4     1        INIT_FCALL                                               'preg_match_all'
          2        SEND_VAL                                                 '%7E%7B%28%5B%5E%5Cd%5CW%5D%5Cw%2A%29%5C%7D%7E'
          3        SEND_VAR                                                 !0
          4        SEND_REF                                                 !1
          5        DO_ICALL                                                 
    5     6        INIT_FCALL                                               'var_dump'
          7        SEND_VAR                                                 !1
          8        DO_ICALL                                                 
          9      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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