Regex for password verification

I've looked at some ideas here, but I still seem to be struggling with a regex coming up to suit my requirements.

I need regex to check password format, criteria:

• At least 1 uppercase letter
• At least 1 room
• Alphanumeric characters only (no special characters)
• At least 8 characters

I am using regex:

^(?=.*[a-z])(?=.*[A-Z])(?=.*\d).{8,}$

      

        
        
        
      

    

However, this also allows the use of type characters !$&

.

Is there some modification I need to make in order to make it stop accepting these special characters?