Create a snippet of Terraform HCL code that create an AWS autoscaling group, and an ALB in front to expose an application to internet.
Sure, here's an example Terraform HCL code that creates an AWS Autoscaling Group and an Application Load Balancer to expose an application to the internet:
``` 
# Configure the AWS provider
provider aws {
  region = us-east-1
}

# Create a security group to allow traffic to the ALB
resource aws_security_group alb_sg {
  name_prefix = alb_sg
  ingress {
    from_port = 80
    to_port = 80
    protocol = tcp
    cidr_blocks = [0.0.0.0/0]
  }
}

# Create an ALB and target group
resource aws_lb alb {
  name               = example-alb
  internal           = false
  load_balancer_type = application

  subnets = [subnet-12345678, subnet-87654321]

  security_groups = [aws_security_group.alb_sg.id]

  tags = {
    Environment = production
  }
}

resource aws_lb_target_group target_group {
  name        = example-target-group
  port        = 80
  protocol    = HTTP
  vpc_id      = vpc-12345678

  health_check {
    path = /health
  }

  tags = {
    Environment = production
  }
}

# Create an autoscaling group
resource aws_launch_configuration launch_configuration {
  name_prefix   = example-lc-
  image_id      = ami-12345678
  instance_type = t2.micro

  # Other settings here (e.g. security groups, userdata, etc.)
}

resource aws_autoscaling_group autoscaling_group {
  name                      = example-asg
  launch_configuration      = aws_launch_configuration.launch_configuration.id
  target_group_arns         = [aws_lb_target_group.target_group.arn]
  health_check_type         = EC2
  min_size                  = 1
  max_size                  = 3
  desired_capacity          = 2
  vpc_zone_identifier       = [subnet-12345678, subnet-87654321]
  termination_policies      = [Default]
  wait_for_capacity_timeout = 10m

  tags = {
    Environment = production
  }
}
``` 
Note that you will need to customize the settings for your specific use case (e.g. specify your own AMI ID, VPC ID, subnet IDs, etc.). This is just an example to give you an idea of how to create an autoscaling group with an ALB in Terraform.