65-Valid Number

Description

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.

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問題描述

驗證給定字串是否為有效的數

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問題分析

面試的時候注意與面試官溝通細節。。。

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解法

class Solution {
    public boolean isNumber(String s) {
        return s.matches("^\\s*[-+]?((\\d+(\\.\\d*)?)|(\\.\\d+))(e[-+]?\\d+)?\\s*$");
    }
}