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<?php $a = preg_replace("#^http://[\S]+/#",'','http://romain.mario.id/test.html'); var_dump($a);
Finding entry points
Branch analysis from position: 0
Jump found. Position 1 = -2
filename:       /in/nJoRF
function name:  (null)
number of ops:  10
compiled vars:  !0 = $a
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   2     0  E >   INIT_FCALL                                               'preg_replace'
         1        SEND_VAL                                                 '%23%5Ehttp%3A%2F%2F%5B%5CS%5D%2B%2F%23'
         2        SEND_VAL                                                 ''
         3        SEND_VAL                                                 'http%3A%2F%2Fromain.mario.id%2Ftest.html'
         4        DO_ICALL                                         $1      
         5        ASSIGN                                                   !0, $1
   3     6        INIT_FCALL                                               'var_dump'
         7        SEND_VAR                                                 !0
         8        DO_ICALL                                                 
         9      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 7.1.0