How to capture data from cookie?

Need a javascript that will capture cookie from _document.cookie and then pass it to a variable.
Also need to strip away some data from cookie. . I only need the portion that says ""AMCVS_C7C319A0574F094D7F000101%40AdobeOrg=1"pass this value to a variable called eVar.. Example of cookie is at the bottom.

Im thinking script should be something like this.

function getCookie(cname) {
   var name = cname + "=";
   var ca = document.cookie.split(';');
   for(var i = 0; i < ca.length; i++) {
       var c = ca;
       while (c.charAt(0) == ' ') {
           c = c.substring(1);
       }
       I'm thinking somewhere in here is where I would strip away the unwanted portion.
       }
   }
   return "";
}

Code (markup):

Please help not sure how to go about this.. Thanks.

Here is an example of a cookie.

"AMCVS_C7C319A0574F094D7F000101%40AdobeOrg=1; AMCV_C7C319A0574F094D7F000101%40AdobeOrg=-1248264605%7CMCIDTS%7C17037%7CMCMID%7C56086522608320454022024251645676171677%7CMCAAMLH-1472181159%7C7%7CMCAAMB-1472583043%7CNRX38WO0n5BH8Th-nqAG_A%7CMCOPTOUT-1471985443s%7CNONE%7CMCAID%7C2BD5B8EF85078B17-60000106C03A19F8;

Code (markup):

​

 

Is the part you need always at the beginning of the cookie? If so all you need to do after the split is a simple ca[0] (with a trim if you don't want the spaces)

 

If I understood correctly what you need:

function getCookie(cName) {
    var cookieArray = document.cookie.split(";");
   
    for (var i = 0; i < cookieArray.length; i++) {
        if (cookieArray[i].indexOf(cName) !== -1) {
            return cookieArray[i].substring(cookieArray[i].indexOf("=") + 1);
        }
    }
 
    return;
}

var   cName = "AMCVS_C7C319A0574F094D7F000101%40AdobeOrg";

alert(getCookie(cName));

Code (markup):