class Ideone {
	
	private static final String PATTERN = "<(\\w+).*?>(.*?)</(\\1)>";
	
	private static final String  REPLACEMENT = "<$1>$2</$1>";
	
	public static void main (String[] args) throws Exception {
		String text = "<img url='blah'>text</img>";
		System.out.println(text.replaceAll(PATTERN, REPLACEMENT));
	}
}