Valid Number leetcode java

描述
Validate if a given string is numeric.
Some examples:
"0" => true
" 0.1 " => true
"abc" => false
"1 a" => false
"2e10" => true
Note: It is intended for the problem statement to be ambiguous. You should gather all requirements
up front before implementing one.
分析
细节实现题。
本题的功能与标准库中的 strtod() 功能类似

有效数字，用正则

代码

public class vaildNumber {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
//        String s="2e10";
           String s="1.5e10";
        System.out.println(vaildNumber(s));
    }
    private static boolean vaildNumber(String s) {
        if(s.length()==0) return false;
//                "0" => true
//                " 0.1 " => true
//                "abc" => false
//                "1 a" => false
//                "2e10" => true
        String regex="\d+(\.\d+)?(e\d+)?" ;  
        return s.matches(regex);
    }
}