正则表达式排除某些错误的数字模式

Question

I have an array of string in java that include good types of numbers:我在 java 中有一个字符串数组，其中包含良好的数字类型：

 String [] valid={"5","-1","0","0.0","8.0","1.5","0.7","-0.2","0.09","-0.15"};

And i have this regex to match and check if those are valid or not:我有这个正则表达式来匹配并检查它们是否有效：

    static boolean checkValidNum(String n){
        return n.matches("^-?\\d+(\\.\\d+)?");
    }

This regex is ok to check what is good and valid num but i want to exclude the following as valid nums:这个正则表达式可以检查什么是好的和有效的数字，但我想排除以下作为有效数字：

    String [] invalidNum = {"001","-00.2","-0","-0.0"};

What should i add to my regex to make it return false on those nums?我应该在我的正则表达式中添加什么以使其在这些数字上返回 false？

Answer 1

Provide some alternatives using |使用|提供一些替代方案, eg ，例如

static boolean checkValidNum(String n) {
    return n.matches("^-?([1-9]\\d*(\\.\\d+)?|0\\.\\d*[1-9]\\d*)|0(\\.0)?");
}