Write a regular expression that extracts the domain name portion of a Web URL (excluding the “ www. ” subdomain if supplied). The protocol portion of the URL should be optional. For example, the expression should extract the domain name “ example.com ” from any of the following URLs:

Enhance the script displayed earlier at Example 31.13 to display not just the URL of each link, but also the link text (the text between the < a > and < /a > tags).

Make an HTML5/JavaScript page documenting whether the special characters 'æ', 'ø', and 'å', and perhaps others, are part of the Regular Expression concept of word characters.

Include the file http://dkexit.eu/downloads/17192_8.js in a web page. It is a JS file holding a string constant named text2. The constant is an annotated poem by Poe, re the C-comments of the file. Make a wordlist in an array by means of a match. How many words are in the text? Make the page print the number.

By traversing the word array make a new array that has all the different words from the first array, and a count for each of those words. Print the array on the page.

Finally the page must display a character count, What is the frequency of each letter in the alphabet. Create an object with the result as in

'use strict';
let obj = {
    a: 2.56,
    b: 0.24,
    ,,,
    z: 0.86
};

and place the results on the page.

This assignment is the same as Section 31.4.4 but with http://dkexit.eu/downloads/8fdmf10.js as input. It is a JS file holding a string constant named text1. The constant is a Danish text from the late 19th century.