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<?php echo preg_replace('/^回复\s+@([^@\s]+)[\s+: | |:]+/', '', '回复 @海超 !');
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/kaP6m
function name:  (null)
number of ops:  7
compiled vars:  none
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   3     0  E >   INIT_FCALL                                               'preg_replace'
         1        SEND_VAL                                                 '%2F%5E%E5%9B%9E%E5%A4%8D%5Cs%2B%40%28%5B%5E%40%5Cs%5D%2B%29%5B%5Cs%2B%3A+%7C+%7C%EF%BC%9A%5D%2B%2F'
         2        SEND_VAL                                                 ''
         3        SEND_VAL                                                 '%E5%9B%9E%E5%A4%8D+%40%E6%B5%B7%E8%B6%85+%EF%BC%81'
         4        DO_ICALL                                         $0      
         5        ECHO                                                     $0
         6      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 7.4.0