Table: Users
+---------------+---------+ +| Column Name | Type | ++---------------+---------+ +| user_id | int | +| name | varchar | +| mail | varchar | ++---------------+---------+ +user_id is the primary key (column with unique values) for this table. +This table contains information of the users signed up in a website. Some e-mails are invalid. ++ +
+ +
Write a solution to find the users who have valid emails.
+ +A valid e-mail has a prefix name and a domain where:
+ +'_', period '.', and/or dash '-'. The prefix name must start with a letter.'@leetcode.com'.Return the result table in any order.
+ +The result format is in the following example.
+ ++
Example 1:
+ +Input: +Users table: ++---------+-----------+-------------------------+ +| user_id | name | mail | ++---------+-----------+-------------------------+ +| 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 | ++---------+-----------+-------------------------+ +Output: ++---------+-----------+-------------------------+ +| user_id | name | mail | ++---------+-----------+-------------------------+ +| 1 | Winston | winston@leetcode.com | +| 3 | Annabelle | bella-@leetcode.com | +| 4 | Sally | sally.come@leetcode.com | ++---------+-----------+-------------------------+ +Explanation: +The mail of user 2 does not have a domain. +The mail of user 5 has the # sign which is not allowed. +The mail of user 6 does not have the leetcode domain. +The mail of user 7 starts with a period. ++