String replacement

as following a string , trying to replace the contents of ABC hello.
ABC < br /> the final result :
hello
ask how to achieve better and faster replacement !
------ Solution ------------------------------------ --------

public class tihuan {
  public static void main(String[] args){
  	String s="<string name=\"STR_ABC\">ABC</string>";
  	System.out.println(s.replaceAll("(<.*>)ABC(<.*>)","$1hello$2" ));
  }
  }
  

------ Solution ------------------------------------ --------
way too much

		String s = "<string name=\"STR_ABC\">ABC</string>";
  		System.out.println(s.replace(">ABC<", ">hello<"));

------ Solution ------------------------------------- -------
nothing encore

  public class tihuan {
  	public static void main(String[] args) {
  		String s = "<string name=\"STR_ABC\">ABC</string>";
  		System.out.println(s.replaceAll("(?<=>)\\w+(?=<)", "hello"));
  	}
  }
  

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essence is a regular problem !
is my piece of the regular expression is too weak !
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essence is a regular problem !   
is my piece of the regular expression is too weak !  
this hard to understand ...
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this is easy to understand , perform discovery performance is also good
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2L that okay ? I just tested on the JSP , the result str output is ABC. Pit father .
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String str = " ABC ";
str.replaceAll ("> ABC <", "> hello <");
%>


Str: <% = str%>


Here is the web interface , do not know what the problem is in addition to , how will output the ABC.