Regex for SQL Server Name, Database Name , SQL Login and Password

We are creating one web application in which one page has data entry form for SQL Server. Here user needs to enter data for SQL Server Name, Database Name and UserName and Password for SQL Authentication. I have referred https://msdn.microsoft.com/en-us/library/ms175874.aspx link for valid characters allowed. But I want regex for all fields SQL Server Name, Database Name and UserName and Password for SQL Authentication so that I can validate their values.