a. Write a JavaScript function to convert an amount entered in USD or PKR to Bitcoin. b. Write a pattern that matches e-mail addresses. C. The personal information part contains the following ASCII characters. Uppercase (A-Z) and lowercase (a-z) English letters, digits (0-9). Characters! # $ % & ' * + - / = ? ^_`{ | } ~ Character.( period, dot or fullstop) provided that it is not the first or last character. Write a php function to check whether a given value is alpha numeric or not using regex.