java匹配字符串

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package shine;import java.util.regex.*;public class GetUrl {public static void main(String[] args) {String str = "<html>abc</html>";Pattern P = Pattern.compile("<html>(.*?)</html>");Matcher m = P.matcher(str);boolean b = m.matches();try{System.out.println(m.group(1));}catch (Exception e){System.out.println("it is not regex success...");}}}