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<?php $strings = [ 'av. St Joan 128', 'Av. st joan 122', 'av. St joan 212', 'Av. St.joan 121', 'AV. st joan 232' ]; $results = preg_grep('~^[^A-Z]*[A-Z]?[^A-Z]*$~', $strings); print_r($results);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/7bGAM
function name:  (null)
number of ops:  10
compiled vars:  !0 = $strings, !1 = $results
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    4     0  E >   ASSIGN                                                   !0, <array>
   12     1        INIT_FCALL                                               'preg_grep'
          2        SEND_VAL                                                 '%7E%5E%5B%5EA-Z%5D%2A%5BA-Z%5D%3F%5B%5EA-Z%5D%2A%24%7E'
          3        SEND_VAR                                                 !0
          4        DO_ICALL                                         $3      
          5        ASSIGN                                                   !1, $3
   14     6        INIT_FCALL                                               'print_r'
          7        SEND_VAR                                                 !1
          8        DO_ICALL                                                 
          9      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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