regex - Java : scanner - I need to read alpha-numeric line including space/tab but not new-line

I am using java scanner to read input from System.in. I need to read alpha-numeric line including space/tab but not the new-line and should not allow empty input as well.

For example :

a new name

or

a-new-name-1

Here is my scanner:

Scanner reader = new Scanner(System.in);

I tried these ways:

String name = reader.nextLine();

or

String name = reader.next("^[A-Za-z0-9- ]+$");

or

name = reader.next("/^[a-z\\d\\-_\\s]+$/i");

For last 2 cases with input "a test name 1" , I had error:

Exception in thread "main" java.util.InputMismatchException
at java.util.Scanner.throwFor(Scanner.java:864)
at java.util.Scanner.next(Scanner.java:1485)
at java.util.Scanner.next(Scanner.java:1418)
............

And when used reader.nextLine(),it's skips waiting for next input.For example:

For this part of the code:

System.out.println("Do you want to update audience name?[y/n]");
opt = reader.next().trim();
if( opt.equalsIgnoreCase("y") )
{
    System.out.println("Enter audience name : ");
    name = reader.nextLine();
}
System.out.println("Do you want to update audience description?[y/n]");
opt = reader.next().trim();
if( opt.equalsIgnoreCase("y") )
{
    System.out.println("Enter audience description : ");
    description = reader.nextLine();
}

I am seeing this:

Do you want to update audience name?[y/n]
y
Enter audience name :
Do you want to update audience description?[y/n]
y
Enter audience description :
Do you want to update audience rule?[y/n]

May I get any help here?