leetcode-problemset/leetcode-cn/originData/find-users-with-valid-e-mails.json

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        "question": {
            "questionId": "1664",
            "questionFrontendId": "1517",
            "categoryTitle": "Database",
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            "title": "Find Users With Valid E-Mails",
            "titleSlug": "find-users-with-valid-e-mails",
            "content": "<p>Table: <code>Users</code></p>\n\n<pre>\n+---------------+---------+\n| Column Name   | Type    |\n+---------------+---------+\n| user_id       | int     |\n| name          | varchar |\n| mail          | varchar |\n+---------------+---------+\nuser_id is the primary key (column with unique values) for this table.\nThis table contains information of the users signed up in a website. Some e-mails are invalid.\n</pre>\n\n<p>&nbsp;</p>\n\n<p>Write a solution to find the users who have <strong>valid emails</strong>.</p>\n\n<p>A valid e-mail has a prefix name and a domain where:</p>\n\n<ul>\n\t<li><strong>The prefix name</strong> is a string that may contain letters (upper or lower case), digits, underscore <code>&#39;_&#39;</code>, period <code>&#39;.&#39;</code>, and/or dash <code>&#39;-&#39;</code>. The prefix name <strong>must</strong> start with a letter.</li>\n\t<li><strong>The domain</strong> is <code>&#39;@leetcode.com&#39;</code>.</li>\n</ul>\n\n<p>Return the result table in <strong>any order</strong>.</p>\n\n<p>The result format is in the following example.</p>\n\n<p>&nbsp;</p>\n<p><strong class=\"example\">Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> \nUsers table:\n+---------+-----------+-------------------------+\n| user_id | name      | mail                    |\n+---------+-----------+-------------------------+\n| 1       | Winston   | winston@leetcode.com    |\n| 2       | Jonathan  | jonathanisgreat         |\n| 3       | Annabelle | bella-@leetcode.com     |\n| 4       | Sally     | sally.come@leetcode.com |\n| 5       | Marwan    | quarz#2020@leetcode.com |\n| 6       | David     | david69@gmail.com       |\n| 7       | Shapiro   | .shapo@leetcode.com     |\n+---------+-----------+-------------------------+\n<strong>Output:</strong> \n+---------+-----------+-------------------------+\n| user_id | name      | mail                    |\n+---------+-----------+-------------------------+\n| 1       | Winston   | winston@leetcode.com    |\n| 3       | Annabelle | bella-@leetcode.com     |\n| 4       | Sally     | sally.come@leetcode.com |\n+---------+-----------+-------------------------+\n<strong>Explanation:</strong> \nThe mail of user 2 does not have a domain.\nThe mail of user 5 has the # sign which is not allowed.\nThe mail of user 6 does not have the leetcode domain.\nThe mail of user 7 starts with a period.\n</pre>\n",
            "translatedTitle": "查找拥有有效邮箱的用户",
            "translatedContent": "<p>表: <code>Users</code></p>\n\n<pre>\n+---------------+---------+\n| Column Name   | Type    |\n+---------------+---------+\n| user_id       | int     |\n| name          | varchar |\n| mail          | varchar |\n+---------------+---------+\nuser_id 是该表的主键（具有唯一值的列）。\n该表包含了网站已注册用户的信息。有一些电子邮件是无效的。\n</pre>\n\n<p>&nbsp;</p>\n\n<p>编写一个解决方案，以查找具有有效电子邮件的用户。</p>\n\n<p>一个有效的电子邮件具有前缀名称和域，其中：</p>\n\n<ol>\n\t<li>&nbsp;<strong>前缀</strong> 名称是一个字符串，可以包含字母（大写或小写），数字，下划线 <code>'_'</code> ，点 <code>'.'</code> 和/或破折号 <code>'-'</code> 。前缀名称 <strong>必须</strong> 以字母开头。</li>\n\t<li><strong>域</strong> 为 <code>'@leetcode.com'</code> 。</li>\n</ol>\n\n<p>以任何顺序返回结果表。</p>\n\n<p>结果的格式如以下示例所示：</p>\n\n<p>&nbsp;</p>\n\n<p><strong class=\"example\">示例 1：</strong></p>\n\n<pre>\n<b>输入：</b>\nUsers 表:\n+---------+-----------+-------------------------+\n| user_id | name      | mail                    |\n+---------+-----------+-------------------------+\n| 1       | Winston   | winston@leetcode.com    |\n| 2       | Jonathan  | jonathanisgreat         |\n| 3       | Annabelle | bella-@leetcode.com     |\n| 4       | Sally     | sally.come@leetcode.com |\n| 5       | Marwan    | quarz#2020@leetcode.com |\n| 6       | David     | david69@gmail.com       |\n| 7       | Shapiro   | .shapo@leetcode.com     |\n+---------+-----------+-------------------------+\n<b>输出：</b>\n+---------+-----------+-------------------------+\n| user_id | name      | mail                    |\n+---------+-----------+-------------------------+\n| 1       | Winston   | winston@leetcode.com    |\n| 3       | Annabelle | bella-@leetcode.com     |\n| 4       | Sally     | sally.come@leetcode.com |\n+---------+-----------+-------------------------+\n<b>解释：</b>\n用户 2 的电子邮件没有域。 \n用户 5 的电子邮件带有不允许的 '#' 符号。\n用户 6 的电子邮件没有 leetcode 域。 \n用户 7 的电子邮件以点开头。\n</pre>\n",
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            "sampleTestCase": "{\"headers\":{\"Users\":[\"user_id\",\"name\",\"mail\"]},\"rows\":{\"Users\":[[1,\"Winston\",\"winston@leetcode.com\"],[2,\"Jonathan\",\"jonathanisgreat\"],[3,\"Annabelle\",\"bella-@leetcode.com\"],[4,\"Sally\",\"sally.come@leetcode.com\"],[5,\"Marwan\",\"quarz#2020@leetcode.com\"],[6,\"David\",\"david69@gmail.com\"],[7,\"Shapiro\",\".shapo@leetcode.com\"]]}}",
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                "insert into Users (user_id, name, mail) values ('1', 'Winston', 'winston@leetcode.com')",
                "insert into Users (user_id, name, mail) values ('2', 'Jonathan', 'jonathanisgreat')",
                "insert into Users (user_id, name, mail) values ('3', 'Annabelle', 'bella-@leetcode.com')",
                "insert into Users (user_id, name, mail) values ('4', 'Sally', 'sally.come@leetcode.com')",
                "insert into Users (user_id, name, mail) values ('5', 'Marwan', 'quarz#2020@leetcode.com')",
                "insert into Users (user_id, name, mail) values ('6', 'David', 'david69@gmail.com')",
                "insert into Users (user_id, name, mail) values ('7', 'Shapiro', '.shapo@leetcode.com')"
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