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 ' '.
A token is a valid word if all three of the following are true:
\n\n'-'. If present, it must be surrounded by lowercase characters ("a-b" is valid, but "-ab" and "ab-" are not valid)."ab,", "cd!", and "." are valid, but "a!b" and "c.," are not valid).Examples of valid words include "a-b.", "afad", "ba-c", "a!", and "!".
Given a string sentence, return the number of valid words in sentence.
\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\n1 <= sentence.length <= 1000sentence only contains lowercase English letters, digits, ' ', '-', '!', '.', and ','.1 token.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。
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'-' 。如果存在，连字符两侧应当都存在小写字母（\"a-b\" 是一个有效单词，但 \"-ab\" 和 \"ab-\" 不是有效单词）。这里给出几个有效单词的例子：\"a-b.\"、\"afad\"、\"ba-c\"、\"a!\" 和 \"!\" 。
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
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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collections<\\/a>\\u3002\\u5982\\u679c\\u60a8\\u9700\\u8981\\u4f7f\\u7528\\u5176\\u4ed6\\u5e93\\u51fd\\u6570\\uff0c\\u8bf7\\u81ea\\u884c\\u5bfc\\u5165\\u3002<\\/p>\\r\\n\\r\\n \\u6ce8\\u610f Python 2.7 \\u5df2\\u4e0d\\u518d\\u7ef4\\u62a4<\\/a>\\u3002 \\u5982\\u60f3\\u4f7f\\u7528\\u6700\\u65b0\\u7248\\u7684Python\\uff0c\\u8bf7\\u9009\\u62e9Python 3\\u3002<\\/p>\"],\"c\":[\"C\",\" \\u7248\\u672c\\uff1a \\u7f16\\u8bd1\\u65f6\\uff0c\\u5c06\\u4f1a\\u91c7\\u7528 \\u4e3a\\u4e86\\u4f7f\\u7528\\u65b9\\u4fbf\\uff0c\\u5927\\u90e8\\u5206\\u6807\\u51c6\\u5e93\\u7684\\u5934\\u6587\\u4ef6\\u5df2\\u7ecf\\u88ab\\u81ea\\u52a8\\u5bfc\\u5165\\u3002<\\/p>\\r\\n\\r\\n \\u5982\\u60f3\\u4f7f\\u7528\\u54c8\\u5e0c\\u8868\\u8fd0\\u7b97, \\u60a8\\u53ef\\u4ee5\\u4f7f\\u7528 uthash<\\/a>\\u3002 \\\"uthash.h\\\"\\u5df2\\u7ecf\\u9ed8\\u8ba4\\u88ab\\u5bfc\\u5165\\u3002\\u8bf7\\u770b\\u5982\\u4e0b\\u793a\\u4f8b:<\\/p>\\r\\n\\r\\n 1. 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"book": null,
"isSubscribed": false,
"isDailyQuestion": false,
"dailyRecordStatus": null,
"editorType": "CKEDITOR",
"ugcQuestionId": null,
"style": "LEETCODE",
"exampleTestcases": "\"cat and dog\"\n\"!this 1-s b8d!\"\n\"alice and bob are playing stone-game10\"",
"__typename": "QuestionNode"
}
}
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