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<?php $regexp = '/^[A-Za-z]+((\.|\_){1}[a-zA-Z0-9]+)*@([a-zA-Z0-9]+([\-]{1}[a-zA-Z0-9]+)*[\.]{1})+[a-zA-Z]{2,4}$/'; echo preg_match($regexp, "id.email@gmail.com");
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/bdHRA
function name:  (null)
number of ops:  7
compiled vars:  !0 = $regexp
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    2     0  E >   ASSIGN                                                   !0, '%2F%5E%5BA-Za-z%5D%2B%28%28%5C.%7C%5C_%29%7B1%7D%5Ba-zA-Z0-9%5D%2B%29%2A%40%28%5Ba-zA-Z0-9%5D%2B%28%5B%5C-%5D%7B1%7D%5Ba-zA-Z0-9%5D%2B%29%2A%5B%5C.%5D%7B1%7D%29%2B%5Ba-zA-Z%5D%7B2%2C4%7D%24%2F'
    3     1        INIT_FCALL                                               'preg_match'
          2        SEND_VAR                                                 !0
          3        SEND_VAL                                                 'id.email%40gmail.com'
          4        DO_ICALL                                         $2      
          5        ECHO                                                     $2
          6      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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