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<?php $strings = [ 'Subject', // expect empty string '1234 Subject', // expect 1234 'Subject 5678', // expect 5678 '1234 Subject 5678', // expect 1234 'Test 1234 Subject 5678 test', // expect 1234 ]; var_export( preg_replace('/^\D+|\d+\K.*/', '', $strings) );
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/R17kD
function name:  (null)
number of ops:  10
compiled vars:  !0 = $strings
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, <array>
   11     1        INIT_FCALL                                               'var_export'
   12     2        INIT_FCALL                                               'preg_replace'
          3        SEND_VAL                                                 '%2F%5E%5CD%2B%7C%5Cd%2B%5CK.%2A%2F'
          4        SEND_VAL                                                 ''
          5        SEND_VAR                                                 !0
          6        DO_ICALL                                         $2      
          7        SEND_VAR                                                 $2
   11     8        DO_ICALL                                                 
   13     9      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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