java中的字符匹配

        //字符表达式        String str1 = "-42223330.31";        String str2 = "237,97996.31";        //过滤字符便于后续处理        str1 = str1.replaceAll(",", "");        str2 = str2.replaceAll(",", "");        //定义模式表达式        Pattern pattern = Pattern.compile("-?(0|([1-9]\\d*))\\.?\\d*");        //构建模式匹配对象        Matcher isNum1 = pattern.matcher(str1);        Matcher isNum2 = pattern.matcher(str2);        //执行模式匹配方法        System.out.println(isNum1.matches());        System.out.println(isNum2.matches());