supporting quoted variable names in Agility's data-bind

gistfile1.js

      // Parse data-bind string of the type '[attribute][=] variable[, [attribute][=] variable ]...'
      // If the variable is not an attribute, it must occur by itself
      //   all pairs in the list are assumed to be attributes
      // Returns { key:'model key', attr: [ {attr : 'attribute', attrVar : 'variable' }... ] }
      _parseBindStr: function(str){
        var obj = {key:null, attr:[]},
            regex = /(?:^|,)\s*(?:([a-zA-Z0-9_\-]+)[\s=]+)?(?:"((?:[^"\\]+|\\["\\])+)"|([a-zA-Z0-9_\-]+))\s*/g,
            keyAssigned = false,
            matched;

        RegExp.lastIndex = 0;
        while ((matched = regex.exec(str)) !== null) {
          // [ "attribute variable", "attribute", "variable" ]
          // or [ "attribute=variable", "attribute", "variable" ]
          // or
          // [ "variable", "variable", undefined ]
          // in some IE it will be [ "variable", "variable", "" ]
          // or
          // null
          var variable;
          if (typeof(matched[2]) === "undefined" || matched[2] === "") {
            variable = matched[3];
          } else {
            variable = matched[2].replace(/\\"/g, '"').replace(/\\\\/g, '\\');
          }
          if (typeof(matched[1]) === "undefined" || matched[1] === "") {
            if (keyAssigned) {
              throw new Error("You may specify only one key (" +
                keyAssigned + " has already been specified in data-bind=" +
                str + ")");
            } else {
              keyAssigned = variable;
              obj.key = variable;
            }
          } else {
            obj.attr.push({attr: matched[1], attrVar: variable});
          }
        } // while (matched)
        
        return obj;
      },