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@@ -8,17 +8,24 @@
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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": null,
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"translatedContent": null,
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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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"isPaidOnly": false,
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"difficulty": "Easy",
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"likes": 0,
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"likes": 2,
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"dislikes": 0,
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"isLiked": null,
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"similarQuestions": "[]",
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"contributors": [],
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"langToValidPlayground": "{\"cpp\": false, \"java\": false, \"python\": false, \"python3\": false, \"mysql\": false, \"mssql\": false, \"oraclesql\": false, \"c\": false, \"csharp\": false, \"javascript\": false, \"typescript\": false, \"bash\": false, \"php\": false, \"swift\": false, \"kotlin\": false, \"dart\": false, \"golang\": false, \"ruby\": false, \"scala\": false, \"html\": false, \"pythonml\": false, \"rust\": false, \"racket\": false, \"erlang\": false, \"elixir\": false, \"pythondata\": false, \"react\": false, \"vanillajs\": false, \"postgresql\": false, \"cangjie\": false}",
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"topicTags": [],
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"langToValidPlayground": "{\"cpp\": false, \"java\": false, \"python3\": false, \"python\": false, \"javascript\": false, \"typescript\": false, \"csharp\": false, \"c\": false, \"golang\": false, \"kotlin\": false, \"swift\": false, \"rust\": false, \"ruby\": false, \"php\": false, \"dart\": false, \"scala\": false, \"elixir\": false, \"erlang\": false, \"racket\": false, \"cangjie\": false, \"bash\": false, \"html\": false, \"pythonml\": false, \"react\": false, \"vanillajs\": false, \"mysql\": false, \"mssql\": false, \"postgresql\": false, \"oraclesql\": false, \"pythondata\": false}",
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"topicTags": [
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{
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"name": "Database",
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"slug": "database",
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"translatedName": "数据库",
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"__typename": "TopicTagNode"
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}
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],
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"companyTagStats": null,
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"codeSnippets": [
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{
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@@ -33,6 +40,12 @@
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"code": "/* Write your T-SQL query statement below */",
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"__typename": "CodeSnippetNode"
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},
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{
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"lang": "PostgreSQL",
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"langSlug": "postgresql",
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"code": "-- Write your PostgreSQL query statement below",
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"__typename": "CodeSnippetNode"
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},
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{
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"lang": "Oracle",
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"langSlug": "oraclesql",
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@@ -44,15 +57,9 @@
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"langSlug": "pythondata",
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"code": "import pandas as pd\n\ndef find_valid_emails(users: pd.DataFrame) -> pd.DataFrame:\n ",
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"__typename": "CodeSnippetNode"
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},
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{
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"lang": "PostgreSQL",
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"langSlug": "postgresql",
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"code": "-- Write your PostgreSQL query statement below",
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"__typename": "CodeSnippetNode"
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}
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],
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"stats": "{\"totalAccepted\": \"55\", \"totalSubmission\": \"63\", \"totalAcceptedRaw\": 55, \"totalSubmissionRaw\": 63, \"acRate\": \"87.3%\"}",
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"stats": "{\"totalAccepted\": \"3.1K\", \"totalSubmission\": \"5.4K\", \"totalAcceptedRaw\": 3133, \"totalSubmissionRaw\": 5428, \"acRate\": \"57.7%\"}",
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"hints": [],
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"solution": null,
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"status": null,
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