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<?php $content = 'Some text that contains src <iframe src="www.example.com"/> Some text'; echo preg_replace('~<iframe[^>]*\K (?=src=)~i', ' data-', $content);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/UXudV
function name:  (null)
number of ops:  8
compiled vars:  !0 = $content
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, 'Some+text+that+contains+src+%3Ciframe+src%3D%22www.example.com%22%2F%3E+Some+text'
    4     1        INIT_FCALL                                               'preg_replace'
          2        SEND_VAL                                                 '%7E%3Ciframe%5B%5E%3E%5D%2A%5CK+%28%3F%3Dsrc%3D%29%7Ei'
          3        SEND_VAL                                                 '+data-'
          4        SEND_VAR                                                 !0
          5        DO_ICALL                                         $2      
          6        ECHO                                                     $2
          7      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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