Leetcode 520. Detect Capital

Given A word, you need to judge whether the usage of capitals in it are right or not.

We define the usage of capitals in a word to being right when one of the following cases holds:

1. All letters in this word is capitals, like "USA".
2. All letters in this word is not capitals, like "Leetcode".
3. Only the first letter of this word was capital if it had more than one letter, like "Google".

Otherwise, we define that this word doesn ' t use capitals in a right-to-do.

Example 1:

Input: "USA" output:true

Example 2:

Input: "FlaG" Output:false

Note:the input is a non-empty word consisting of uppercase and lowercase Latin letters.

This problem stunned me, I thought is must be equal to the USA or leetcode just let, and then the rest of the word is the first letter capitalization, the results are not submitted wrong, then really do not want to search someone else's answer, the result, found that I understand the wrong = =,,

var function (word) {    return /^ ([a-z]+|[ a-z]+| [A-z] [a-z]+) $/. Test (Word);      };

The regular expression is done!

Leetcode 520. Detect Capital