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https://gitee.com/coder-xiaomo/leetcode-problemset
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92 lines
10 KiB
JSON
92 lines
10 KiB
JSON
{
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"questionId": "3782",
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"questionFrontendId": "3436",
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"categoryTitle": "Database",
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"boundTopicId": 3059804,
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"title": "Find Valid Emails",
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"titleSlug": "find-valid-emails",
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"content": "<p>Table: <code>Users</code></p>\n\n<pre>\n+-----------------+---------+\n| Column Name | Type |\n+-----------------+---------+\n| user_id | int |\n| email | varchar |\n+-----------------+---------+\n(user_id) is the unique key for this table.\nEach row contains a user's unique ID and email address.\n</pre>\n\n<p>Write a solution to find all the <strong>valid email addresses</strong>. A valid email address meets the following criteria:</p>\n\n<ul>\n\t<li>It contains exactly one <code>@</code> symbol.</li>\n\t<li>It ends with <code>.com</code>.</li>\n\t<li>The part before the <code>@</code> symbol contains only <strong>alphanumeric</strong> characters and <strong>underscores</strong>.</li>\n\t<li>The part after the <code>@</code> symbol and before <code>.com</code> contains a domain name <strong>that contains only letters</strong>.</li>\n</ul>\n\n<p>Return<em> the result table ordered by</em> <code>user_id</code> <em>in</em> <strong>ascending </strong><em>order</em>.</p>\n\n<p> </p>\n<p><strong class=\"example\">Example:</strong></p>\n\n<div class=\"example-block\">\n<p><strong>Input:</strong></p>\n\n<p>Users table:</p>\n\n<pre class=\"example-io\">\n+---------+---------------------+\n| user_id | email |\n+---------+---------------------+\n| 1 | alice@example.com |\n| 2 | bob_at_example.com |\n| 3 | charlie@example.net |\n| 4 | david@domain.com |\n| 5 | eve@invalid |\n+---------+---------------------+\n</pre>\n\n<p><strong>Output:</strong></p>\n\n<pre class=\"example-io\">\n+---------+-------------------+\n| user_id | email |\n+---------+-------------------+\n| 1 | alice@example.com |\n| 4 | david@domain.com |\n+---------+-------------------+\n</pre>\n\n<p><strong>Explanation:</strong></p>\n\n<ul>\n\t<li><strong>alice@example.com</strong> is valid because it contains one <code>@</code>, alice is alphanumeric, and example.com starts with a letter and ends with .com.</li>\n\t<li><strong>bob_at_example.com</strong> is invalid because it contains an underscore instead of an <code>@</code>.</li>\n\t<li><strong>charlie@example.net</strong> is invalid because the domain does not end with <code>.com</code>.</li>\n\t<li><strong>david@domain.com</strong> is valid because it meets all criteria.</li>\n\t<li><strong>eve@invalid</strong> is invalid because the domain does not end with <code>.com</code>.</li>\n</ul>\n\n<p>Result table is ordered by user_id in ascending order.</p>\n</div>\n",
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"translatedTitle": "查找合法邮箱",
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"translatedContent": "<p>表：<code>Users</code></p>\n\n<pre>\n+-----------------+---------+\n| Column Name | Type |\n+-----------------+---------+\n| user_id | int |\n| email | varchar |\n+-----------------+---------+\n(user_id) 是这张表的唯一主键。\n每一行包含用户的唯一 ID 和邮箱地址。\n</pre>\n\n<p>编写一个解决方案来查找所有 <b>合法邮箱地址</b>。一个合法的邮箱地址符合下述条件：</p>\n\n<ul>\n\t<li>只包含一个 <code>@</code> 符号。</li>\n\t<li>以 <code>.com</code> 结尾。</li>\n\t<li><code>@</code> 符号前面的部分只包含 <strong>字母数字</strong> 字符和 <strong>下划线</strong>。</li>\n\t<li><code>@</code> 符号后面与 <code>.com</code> 前面的部分 包含 <strong>只有字母 </strong>的域名。</li>\n</ul>\n\n<p>返回结果表以 <code>user_id</code> <strong>升序</strong> 排序。</p>\n\n<p> </p>\n\n<p><strong class=\"example\">示例：</strong></p>\n\n<div class=\"example-block\">\n<p><strong>输入：</strong></p>\n\n<p>Users 表：</p>\n\n<pre class=\"example-io\">\n+---------+---------------------+\n| user_id | email |\n+---------+---------------------+\n| 1 | alice@example.com |\n| 2 | bob_at_example.com |\n| 3 | charlie@example.net |\n| 4 | david@domain.com |\n| 5 | eve@invalid |\n+---------+---------------------+\n</pre>\n\n<p><strong>输出：</strong></p>\n\n<pre class=\"example-io\">\n+---------+-------------------+\n| user_id | email |\n+---------+-------------------+\n| 1 | alice@example.com |\n| 4 | david@domain.com |\n+---------+-------------------+\n</pre>\n\n<p><strong>解释：</strong></p>\n\n<ul>\n\t<li><strong>alice@example.com</strong> 是合法的因为它包含一个 <code>@</code>，alice 是只有字母数字的，并且 example.com 以字母开始并以 .com 结束。</li>\n\t<li><strong>bob_at_example.com</strong> 是不合法的因为它包含下划线但没有 <code>@</code>。</li>\n\t<li><strong>charlie@example.net</strong> 是不合法的因为域名没有以 <code>.com</code> 结尾。</li>\n\t<li><strong>david@domain.com</strong> 是合法的因为它满足所有条件。</li>\n\t<li><strong>eve@invalid</strong> 是不合法的因为域名没有以 <code>.com</code> 结尾。</li>\n</ul>\n\n<p>结果表以 user_id 升序排序。</p>\n</div>\n",
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"sampleTestCase": "{\"headers\":{\"Users\":[\"user_id\",\"email\"]},\"rows\":{\"Users\":[[1,\"alice@example.com\"],[2,\"bob_at_example.com\"],[3,\"charlie@example.net\"],[4,\"david@domain.com\"],[5,\"eve@invalid\"]]}}",
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"insert into Users (user_id, email) values ('1', 'alice@example.com')",
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"insert into Users (user_id, email) values ('2', 'bob_at_example.com')",
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"insert into Users (user_id, email) values ('3', 'charlie@example.net')",
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"insert into Users (user_id, email) values ('4', 'david@domain.com')",
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"insert into Users (user_id, email) values ('5', 'eve@invalid')"
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"exampleTestcases": "{\"headers\":{\"Users\":[\"user_id\",\"email\"]},\"rows\":{\"Users\":[[1,\"alice@example.com\"],[2,\"bob_at_example.com\"],[3,\"charlie@example.net\"],[4,\"david@domain.com\"],[5,\"eve@invalid\"]]}}",
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