Replace all in StringBuffer

I have a StringBuffer object, in the following value is repeated at several places.
<?xml version="1.0" encoding="UTF-8"?>
I want to replace all these values with a blank. I can't see a replaceAll function in StringBuffer. Can you please let me know how to do this?
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You need to turn it into a String first
(that is if you don't want to use )

Use StringBuilder in preference to StringBuffer where you can
what about convert the string buffer into string, the perform replaceAll, and then return back to string buffer?
StringBuffer sb = new StringBuffer("<?xml version=\"1.0\" encoding=\"UTF-8\"?>blablablabaa<?xml version=\"1.0\" encoding=\"UTF-8\"?>");
String replaceStr = "<\\?xml version=\"1.0\" encoding=\"UTF-8\"\\?>";
sb = new StringBuffer( sb.toString().replaceAll(replaceStr, "") );

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