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<?php echo preg_replace('/(^|\s)us([\S]+)/i', '<b>$0</b>', 'usa usa ususa');
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/dJiHP
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%28%5E%7C%5Cs%29us%28%5B%5CS%5D%2B%29%2Fi'
          2        SEND_VAL                                                 '%3Cb%3E%240%3C%2Fb%3E'
          3        SEND_VAL                                                 'usa+usa+ususa'
          4        DO_ICALL                                         $0      
          5        ECHO                                                     $0
          6      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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