LeetCode 520. Detect Capital
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Given a word, you need to judge whether the usage of capitals in it is right or not.
We define the usage of capitals in a word to be right when one of the following cases holds:
- All letters in this word are capitals, like "USA".
- All letters in this word are not capitals, like "leetcode".
- Only the first letter in this word is capital if it has more than one letter, like "Google".
Otherwise, we define that this word doesn‘t use capitals in a right way.
Example 1:
Input: "USA" Output: True
Example 2:
Input: "FlaG" Output: False
Note: The input will be a non-empty word consisting of uppercase and lowercase latin letters.
这道题晕死我了,我以为是一定要等于USA或者leetcode才让过,然后剩下的单词就是第一个字母大写,结果怎么都提交不对,后来实在没辙想着去搜下别人的答案吧,结果,发现是我理解错了= =、、
var detectCapitalUse = function(word) { return /^([A-Z]+|[a-z]+|[A-Z][a-z]+)$/.test(word); };
正则表达式就搞定了!
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LeetCode - 520. Detect Capital