Trim ALL tabs, newlines, and unnecessary whitespace from a string in Javascript, simple extension to the String prototype

TrimWhitespace.js

// For the purposes of this gist, assume we have declared the variable str and it is actually a string.
var str = "This is my awesome string. \n I love strings. \n\t\t\t Stringy string string!         \n\t\t\t\tWhat??";

// Regex to remove all tabs and newlines.
str = str.replace(/[\t]|[\n]/gm, '');

// Regex to replace all sets of 2 or more space characters with a single space
str = str.replace(/\s{2,}/g, ' ');

// Regex to remove all HTML comments
str = str.replace(/<!--(.*?)-->/gm, "");

// And a wrapper method that extends the String prototype method and does it all for you.
String.prototype.trim = function() { 
  return this.replace(/<!--(.*?)-->/gm, "").replace(/[\t]|[\n]/gm, '').replace(/\s{2,}/g, ' ');
}