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<?php $str = '自此直至2010年n'; preg_match_all('/(\w+)/U', $str, $matches); print_r($matches[0]);
based on c0469
Finding entry points
Branch analysis from position: 0
Jump found. Position 1 = -2
filename:       /in/QttWr
function name:  (null)
number of ops:  11
compiled vars:  !0 = $str, !1 = $matches
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   3     0  E >   ASSIGN                                                   !0, '%E8%87%AA%E6%AD%A4%E7%9B%B4%E8%87%B32010%E5%B9%B4n'
   4     1        INIT_FCALL                                               'preg_match_all'
         2        SEND_VAL                                                 '%2F%28%5Cw%2B%29%2FU'
         3        SEND_VAR                                                 !0
         4        SEND_REF                                                 !1
         5        DO_ICALL                                                 
   5     6        INIT_FCALL                                               'print_r'
         7        FETCH_DIM_R                                      $4      !1, 0
         8        SEND_VAR                                                 $4
         9        DO_ICALL                                                 
        10      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 7.3.0