leetcode-problemset/leetcode-cn/originData/number-of-valid-words-in-a-sentence.json

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        "question": {
            "questionId": "2173",
            "questionFrontendId": "2047",
            "categoryTitle": "Algorithms",
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            "title": "Number of Valid Words in a Sentence",
            "titleSlug": "number-of-valid-words-in-a-sentence",
            "content": "<p>A sentence consists of lowercase letters (<code>&#39;a&#39;</code> to <code>&#39;z&#39;</code>), digits (<code>&#39;0&#39;</code> to <code>&#39;9&#39;</code>), hyphens (<code>&#39;-&#39;</code>), punctuation marks (<code>&#39;!&#39;</code>, <code>&#39;.&#39;</code>, and <code>&#39;,&#39;</code>), and spaces (<code>&#39; &#39;</code>) only. Each sentence can be broken down into <strong>one or more tokens</strong> separated by one or more spaces <code>&#39; &#39;</code>.</p>\n\n<p>A token is a valid word if <strong>all three</strong> of the following are true:</p>\n\n<ul>\n\t<li>It only contains lowercase letters, hyphens, and/or punctuation (<strong>no</strong> digits).</li>\n\t<li>There is <strong>at most one</strong> hyphen <code>&#39;-&#39;</code>. If present, it <strong>must</strong> be surrounded by lowercase characters (<code>&quot;a-b&quot;</code> is valid, but <code>&quot;-ab&quot;</code> and <code>&quot;ab-&quot;</code> are not valid).</li>\n\t<li>There is <strong>at most one</strong> punctuation mark. If present, it <strong>must</strong> be at the <strong>end</strong> of the token (<code>&quot;ab,&quot;</code>, <code>&quot;cd!&quot;</code>, and <code>&quot;.&quot;</code> are valid, but <code>&quot;a!b&quot;</code> and <code>&quot;c.,&quot;</code> are not valid).</li>\n</ul>\n\n<p>Examples of valid words include <code>&quot;a-b.&quot;</code>, <code>&quot;afad&quot;</code>, <code>&quot;ba-c&quot;</code>, <code>&quot;a!&quot;</code>, and <code>&quot;!&quot;</code>.</p>\n\n<p>Given a string <code>sentence</code>, return <em>the <strong>number</strong> of valid words in </em><code>sentence</code>.</p>\n\n<p>&nbsp;</p>\n<p><strong class=\"example\">Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> sentence = &quot;<u>cat</u> <u>and</u>  <u>dog</u>&quot;\n<strong>Output:</strong> 3\n<strong>Explanation:</strong> The valid words in the sentence are &quot;cat&quot;, &quot;and&quot;, and &quot;dog&quot;.\n</pre>\n\n<p><strong class=\"example\">Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> sentence = &quot;!this  1-s b8d!&quot;\n<strong>Output:</strong> 0\n<strong>Explanation:</strong> There are no valid words in the sentence.\n&quot;!this&quot; is invalid because it starts with a punctuation mark.\n&quot;1-s&quot; and &quot;b8d&quot; are invalid because they contain digits.\n</pre>\n\n<p><strong class=\"example\">Example 3:</strong></p>\n\n<pre>\n<strong>Input:</strong> sentence = &quot;<u>alice</u> <u>and</u>  <u>bob</u> <u>are</u> <u>playing</u> stone-game10&quot;\n<strong>Output:</strong> 5\n<strong>Explanation:</strong> The valid words in the sentence are &quot;alice&quot;, &quot;and&quot;, &quot;bob&quot;, &quot;are&quot;, and &quot;playing&quot;.\n&quot;stone-game10&quot; is invalid because it contains digits.\n</pre>\n\n<p>&nbsp;</p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 &lt;= sentence.length &lt;= 1000</code></li>\n\t<li><code>sentence</code> only contains lowercase English letters, digits, <code>&#39; &#39;</code>, <code>&#39;-&#39;</code>, <code>&#39;!&#39;</code>, <code>&#39;.&#39;</code>, and <code>&#39;,&#39;</code>.</li>\n\t<li>There will be at least&nbsp;<code>1</code> token.</li>\n</ul>\n",
            "translatedTitle": "句子中的有效单词数",
            "translatedContent": "<p>句子仅由小写字母（<code>'a'</code> 到 <code>'z'</code>）、数字（<code>'0'</code> 到 <code>'9'</code>）、连字符（<code>'-'</code>）、标点符号（<code>'!'</code>、<code>'.'</code> 和 <code>','</code>）以及空格（<code>' '</code>）组成。每个句子可以根据空格分解成 <strong>一个或者多个 token</strong> ，这些 token 之间由一个或者多个空格 <code>' '</code> 分隔。</p>\n\n<p>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：</p>\n\n<ul>\n\t<li>仅由小写字母、连字符和/或标点（不含数字）\b组成。</li>\n\t<li><strong>至多一个</strong> 连字符 <code>'-'</code> 。如果存在，连字符两侧应当都存在小写字母（<code>\"a-b\"</code> 是一个有效单词，但 <code>\"-ab\"</code> 和 <code>\"ab-\"</code> 不是有效单词）。</li>\n\t<li><strong>至多一个 </strong>标点符号。如果存在，标点符号应当位于 token 的 <strong>末尾</strong> 。</li>\n</ul>\n\n<p>这里给出几个有效单词的例子：<code>\"a-b.\"</code>、<code>\"afad\"</code>、<code>\"ba-c\"</code>、<code>\"a!\"</code> 和 <code>\"!\"</code> 。</p>\n\n<p>给你一个字符串 <code>sentence</code> ，请你找出并返回<em> </em><code>sentence</code> 中<strong> 有效单词的数目</strong> 。</p>\n\n<p>&nbsp;</p>\n\n<p><strong>示例 1：</strong></p>\n\n<pre>\n<strong>输入：</strong>sentence = \"<em><strong>cat</strong></em> <em><strong>and</strong></em>  <em><strong>dog</strong></em>\"\n<strong>输出：</strong>3\n<strong>解释：</strong>句子中的有效单词是 \"cat\"、\"and\" 和 \"dog\"\n</pre>\n\n<p><strong>示例 2：</strong></p>\n\n<pre>\n<strong>输入：</strong>sentence = \"!this  1-s b8d!\"\n<strong>输出：</strong>0\n<strong>解释：</strong>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</pre>\n\n<p><strong>示例 3：</strong></p>\n\n<pre>\n<strong>输入：</strong>sentence = \"<em><strong>alice</strong></em> <em><strong>and</strong></em>  <em><strong>bob</strong></em> <em><strong>are</strong></em> <em><strong>playing</strong></em> stone-game10\"\n<strong>输出：</strong>5\n<strong>解释：</strong>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</pre>\n\n<p>&nbsp;</p>\n\n<p><strong>提示：</strong></p>\n\n<ul>\n\t<li><code>1 &lt;= sentence.length &lt;= 1000</code></li>\n\t<li><code>sentence</code> 由小写英文字母、数字（<code>0-9</code>）、以及字符（<code>' '</code>、<code>'-'</code>、<code>'!'</code>、<code>'.'</code> 和 <code>','</code>）组成</li>\n\t<li>句子中至少有 <code>1</code> 个 token</li>\n</ul>\n",
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