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<?php $string = 'b7001_cp---_parc1323546_venc.,?><_ fluxo'; echo preg_replace('/^b[0-9]{4}\K|[^a-z_]/', '', $string);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/Hl9Lt
function name:  (null)
number of ops:  5
compiled vars:  !0 = $string
line      #* E I O op                               fetch          ext  return  operands
-----------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                       !0, 'b7001_cp---_parc1323546_venc.%2C%3F%3E%3C_+++++fluxo'
    4     1        FRAMELESS_ICALL_3                preg_replace        ~2      '%2F%5Eb%5B0-9%5D%7B4%7D%5CK%7C%5B%5Ea-z_%5D%2F', ''
          2        OP_DATA                                                      !0
          3        ECHO                                                         ~2
          4      > RETURN                                                       1

Generated using Vulcan Logic Dumper, using php 8.5.0


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