import java.util.regex.Matcher;import java.util.regex.Pattern;public class Replace {        public static void main(String[] args) {        String str = "{f.name} and {f.age}";        String pattern = "\\{[^}]*\\}";                Pattern p = Pattern.compile(pattern);        Matcher m = p.matcher(str);        while (m.find()) {            String g = m.group();            String target = g.substring(1, g.length() - 1);//去掉花括号            str = str.replace(g,target + " <= '2019-09-09'");        }                System.out.println("str:" + str);    }}