Create find-valid-emails.sql

Author: kamyu104

MySQL/find-valid-emails.sql

@@ -0,0 +1,8 @@
+# Time:  O(n)
+# Space: O(n)
+
+# regular expression
+SELECT user_id, email 
+FROM users
+WHERE email REGEXP '^[a-zA-Z0-9_]+@[a-zA-Z]+\.com$'
+ORDER BY 1;