1. Using the above regex string, create a regex string for two of the following credit card types without using the group (?:[0-9]{3}) 1. MasterCard 2. Discover 3. American Express

discrete structure.  plz help i have only 30 minutes i will rate you i need help

// Declare data fields: a String named customerName, // an int named numItems, and // a double named totalCost.// Your code here... // Implement the default contructor.// Set the value of customerName to "no name"// and use zero for the other data fields.// Your code here... // Implement the overloaded constructor that// passes new values to all data fields.// Your code here... // Implement method getTotalCost to return the totalCost.// Your code here... // Implement method buyItem.//// Adds itemCost to the total cost and increments// (adds 1 to) the number of items in the cart.//// Parameter: a double itemCost indicating the cost of the item.public void buyItem(double itemCost){// Your code here... }// Implement method applyCoupon.//// Apply a coupon to the total cost of the cart.// - Normal coupon: the unit discount is subtracted ONCE// from the total cost.// - Bonus coupon: the unit discount is subtracted TWICE// from the total cost.// - HOWEVER, a bonus coupon only applies if the…

3. Which among the following shows a valid use of the Direction enumeration as a parameter to the moveCharacter function? Select al that apply. enum Direction {  case north, south, west, east}func moveCharacter(x: Int, y: Int, facing: Direction) {// code here}   moveCharacter(x: 0, y: 0, facing: .southwest)   moveCharacter(x: 0, y: 0, facing: Direction.north)   moveCharacter(x: 0, y: 0, facing: .south)   moveCharacter(x: 0, y: 0, facing: Direction.northeast)