Parse query string in JavaScript [duplicate]

Answer 1

The following function will parse the search string with a regular expression, cache the result and return the value of the requested variable:

window.getSearch = function(variable) {
  var parsedSearch;
  parsedSearch = window.parsedSearch || (function() {
    var match, re, ret;
    re = /\??(.*?)=([^\&]*)&?/gi;
    ret = {};
    while (match = re.exec(document.location.search)) {
      ret[match[1]] = match[2];
    }
    return window.parsedSearch = ret;
  })();
  return parsedSearch[variable];
};

You can either call it once without any parameters and work with the window.parsedSearch object, or call getSearch subsequently. I haven't fully tested this, the regular expression might still need some tweaking...