{ "data": { "question": { "questionId": "2173", "questionFrontendId": "2047", "categoryTitle": "Algorithms", "boundTopicId": 1060696, "title": "Number of Valid Words in a Sentence", "titleSlug": "number-of-valid-words-in-a-sentence", "content": "

A sentence consists of lowercase letters ('a' to 'z'), digits ('0' to '9'), hyphens ('-'), punctuation marks ('!', '.', and ','), and spaces (' ') only. Each sentence can be broken down into one or more tokens separated by one or more spaces ' '.

\n\n

A token is a valid word if all three of the following are true:

\n\n\n\n

Examples of valid words include "a-b.", "afad", "ba-c", "a!", and "!".

\n\n

Given a string sentence, return the number of valid words in sentence.

\n\n

 

\n

Example 1:

\n\n
\nInput: sentence = "cat and  dog"\nOutput: 3\nExplanation: The valid words in the sentence are "cat", "and", and "dog".\n
\n\n

Example 2:

\n\n
\nInput: sentence = "!this  1-s b8d!"\nOutput: 0\nExplanation: There are no valid words in the sentence.\n"!this" is invalid because it starts with a punctuation mark.\n"1-s" and "b8d" are invalid because they contain digits.\n
\n\n

Example 3:

\n\n
\nInput: sentence = "alice and  bob are playing stone-game10"\nOutput: 5\nExplanation: The valid words in the sentence are "alice", "and", "bob", "are", and "playing".\n"stone-game10" is invalid because it contains digits.\n
\n\n

 

\n

Constraints:

\n\n\n", "translatedTitle": "句子中的有效单词数", "translatedContent": "

句子仅由小写字母（'a' 到 'z'）、数字（'0' 到 '9'）、连字符（'-'）、标点符号（'!'、'.' 和 ','）以及空格（' '）组成。每个句子可以根据空格分解成 一个或者多个 token ，这些 token 之间由一个或者多个空格 ' ' 分隔。

\n\n

如果一个 token 同时满足下述条件，则认为这个 token 是一个有效单词：

\n\n\n\n

这里给出几个有效单词的例子：\"a-b.\"、\"afad\"、\"ba-c\"、\"a!\" 和 \"!\" 。

\n\n

给你一个字符串 sentence ，请你找出并返回 sentence 中 有效单词的数目 。

\n\n

 

\n\n

示例 1：

\n\n
\n输入：sentence = \"cat and  dog\"\n输出：3\n解释：句子中的有效单词是 \"cat\"、\"and\" 和 \"dog\"\n
\n\n

示例 2：

\n\n
\n输入：sentence = \"!this  1-s b8d!\"\n输出：0\n解释：句子中没有有效单词\n\"!this\" 不是有效单词，因为它以一个标点开头\n\"1-s\" 和 \"b8d\" 也不是有效单词，因为它们都包含数字\n
\n\n

示例 3：

\n\n
\n输入：sentence = \"alice and  bob are playing stone-game10\"\n输出：5\n解释：句子中的有效单词是 \"alice\"、\"and\"、\"bob\"、\"are\" 和 \"playing\"\n\"stone-game10\" 不是有效单词，因为它含有数字\n
\n\n

 

\n\n

提示：

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