RegEx to extract URL from CSS background styling

Question

I have a string in this form:

url(\"http://www.example.com/imgs/backgrounds/bg80.jpg\") repeat scroll 10% 0% transparent

This is from a CSS sty

Answer 1

So here's a cleaned up version that only focuses on images & converts found images relative paths to absolute. This way you can preload easily. This code creates an array with original URL and absolute URL. You can simply loop through the result and preload the absolute URL images

var myString = " \
    background: url(../images/magnifier-ico.png) no-repeat left center; \
    background: url(../../images/globe-ico.png) no-repeat; \
    background: url(../images/magnifier-ico.png) no-repeat left center; \
";

var myRegexp = /(?:\(['|"]?)(.*?\.(png|jpg|gif|jpeg|tiff){1})(?:['|"]?\))/gi;

// Set location of CSS file being read
var cssFile = "/css/mobile/style.css";

// Figure out depth of the css file in relation to root
var cssPath = cssFile.split("/").filter(function(item){return item.length>0;});
var depth = (cssPath.length);

// Array to store found images
var images = [];

// Start search
var match = myRegexp.exec(myString);
while (match) {
  // get image
  var foundImage = match[1];

  // Look for next one
  match = myRegexp.exec(myString);

  // Convert relative path to absolute
  var relativeDepth = 0;
  var pathRegexp = /\.\.\//gi;
  var pathMatch = pathRegexp.exec(foundImage);
  while(pathMatch){
    relativeDepth++;
    pathMatch = pathRegexp.exec(foundImage);
  }
  // Strip the relativity
  var pathlessImage = foundImage.split("../").join("");
  // Now to the final conversion
  var absolute = "";
  for(var i=0;i

Here's working JSbin http://jsbin.com/nalimaruvu/2/