Table: Users
\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\n\n
Write a solution to find all the valid email addresses. A valid email address meets the following criteria:
\n\n@ symbol..com.@ symbol contains only alphanumeric characters and underscores.@ symbol and before .com contains a domain name that contains only letters.Return the result table ordered by user_id in ascending order.
\n
Example:
\n\nInput:
\n\nUsers table:
\n\n\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\n\n
Output:
\n\n\n+---------+-------------------+\n| user_id | email |\n+---------+-------------------+\n| 1 | alice@example.com |\n| 4 | david@domain.com |\n+---------+-------------------+\n\n\n
Explanation:
\n\n@, alice is alphanumeric, and example.com starts with a letter and ends with .com.@..com..com.Result table is ordered by user_id in ascending order.
\n表：Users
\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\n\n
编写一个解决方案来查找所有 合法邮箱地址。一个合法的邮箱地址符合下述条件：
\n\n@ 符号。.com 结尾。@ 符号前面的部分只包含 字母数字 字符和 下划线。@ 符号后面与 .com 前面的部分 包含 只有字母 的域名。返回结果表以 user_id 升序 排序。
\n\n
示例：
\n\n输入：
\n\nUsers 表：
\n\n\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\n\n
输出：
\n\n\n+---------+-------------------+\n| user_id | email |\n+---------+-------------------+\n| 1 | alice@example.com |\n| 4 | david@domain.com |\n+---------+-------------------+\n\n\n
解释：
\n\n@，alice 是只有字母数字的，并且 example.com 以字母开始并以 .com 结束。@。.com 结尾。.com 结尾。结果表以 user_id 升序排序。
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