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<?php var_dump(preg_match('/[a]*/', 'http://file.baixing.net/month_1404/20140401e297411e.jpg'));
Finding entry points
Branch analysis from position: 0
Jump found. Position 1 = -2
filename:       /in/qLGn8
function name:  (null)
number of ops:  8
compiled vars:  none
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   2     0  E >   INIT_FCALL                                               'var_dump'
         1        INIT_FCALL                                               'preg_match'
         2        SEND_VAL                                                 '%2F%5Ba%5D%2A%2F'
         3        SEND_VAL                                                 'http%3A%2F%2Ffile.baixing.net%2Fmonth_1404%2F20140401e297411e.jpg'
         4        DO_ICALL                                         $0      
         5        SEND_VAR                                                 $0
         6        DO_ICALL                                                 
         7      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 7.2.0