urlsToAnchors

// returns a string
	function sanitizeURL(string){
		// removes the slash at the end of the URL
		if(string.charAt(string.length-1) == "/"){
			return string = string.substr(0,string.length-1);
		}
	}
 
	// takes the string of the HTML and the array of links in this HTML
	// returns a string
	function urlsToAnchors(domElement){
		// in the string we find the urls matched
		// we put these urls in an array
		string = domElement.innerHTML;
		// console.log(string)
		array = domElement.getElementsByTagName("a");
		stringsArray = string.match(/(([A-Za-z]{3,9}):\/\/([-;:&=\+\$,\w]+@{1})?([-A-Za-z0-9\.]+)+:?(\d+)?((\/[-\+~%\/\.\w]+)?\??([-\+=&;%@\.\w]+)?#?([\w]+)?)?)/gi);
		// we then loop into this array to find and replace recursively in the string the URL by an Anchor tag containing this exact URL
		var j = 0;
		for(j; j<array.length; j++){
			// loop in the array of strings
			var k = 0;
			// console.log(stringsArray.length);
			for(k; k<stringsArray.length; k++){
				// if this item matches an item in the other array's items
				var url = sanitizeURL(array[j].href);
				if(stringsArray[k]== url){
					// remove the element from the array
					stringsArray.splice(k,1);
				}
			}
		}
		// loop in the urls array and add the links to the HTML containing their respective url
		var i = 0;
		for(i; i<stringsArray.length; i++){
			// if there is an HTTP in the URL
			if(stringsArray[i].match(/(http|https):\/\//)){
				string = string.replace(stringsArray[i],"<a href='"+stringsArray[i]+"'>"+stringsArray[i]+"</a>");
			}
		}
 
		// returns the HTML code to inject into the node (with the innerHTML property)
		return string;
	}
 
	window.onload = function(){ 		
		document.getElementsByTagName("p")[0].innerHTML = urlsToAnchors(document.getElementsByTagName("p")[0]);
	}