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Comparing two RegExp and String parsing methods for getting a value from a cookie.

Then adding in Lawnchair's cookie parser, for fun.

Preparation code

<script src="//ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js">
</script>
<script src="https://raw.github.com/carhartl/jquery-cookie/master/jquery.cookie.js"></script>
<script>
  function generateCookieString(count) {
    var name = "name",
        stringParts = [],
        array = new Array(6);
    for(var j = 1; j <= count; j++)
    {
        stringParts.push(name + j + '=' + array.join(name+j));
    }
    return stringParts.join(';');
  }
  
  function string(name, cookie) {
    setPos = cookie.indexOf(name + '='), stopPos = cookie.indexOf(';', setPos);

    // Dataset does not exist, attempt to register default
    return !~setPos ? null : cookie.substring(
    setPos, ~stopPos ? stopPos : undefined).split('=')[1];
  }

  function regexp(name, cookie) {
    var regex = new RegExp(name + '=([^;]*)', 'g'),
        result = regex.exec(cookie);

    return result[1] || null;
  }
  function getStrCookie(name) {
  var regex = new RegExp("(^" + name + "=([a-zA-Z-_0-9]+);?.*)|(.*;\\s?" + name + "=([a-zA-Z-_0-9]+);?.*)"),
      cookie = document.cookie;
  return cookie.match(regex) ? cookie.replace(regex, "$2$4") : '';
}

  function lawnchair(name, cookie) {
    var nameEQ = name + '=',
        ca = cookie.split(';'),
        len = ca.length,
        i = 0,
        c;

    for (; i < len; i++) {
      c = ca[i];
      while (c.charAt(0) == ' ') {
        c = c.substring(1, c.length);
      }
      if (c.indexOf(nameEQ) == 0) {
        return c.substring(nameEQ.length, c.length);
      }
    }
    return null;

  }

  function simplesplits(name, cookie) {

    var parts = cookie.split(name);

    return parts.length === 0 ? null : parts[1].split('=')[1].split(';')[0];

  }

function CookieHandler() {
  function CookieParser() {
    var kvs = document.cookie.split(";");

    function trim(stringToTrim) { return stringToTrim.replace(/^\s+|\s+$/g,""); }

    function parseCookies() {
      var result = {};
      $.each(kvs, function(i, v) {
        var kvp = v.split("=");
        result[trim(kvp[0])] = kvp[1];
      });
      return result;
    }
    return { cookies : function() { return parseCookies(); } };
  }

  return {
    getCookies  : CookieParser().cookies,
    getCookie   : function(cookieName) { return CookieParser().cookies()[cookieName] || null; }  };
}

  var cookieString = generateCookieString(30);
</script>

Preparation code output

Test runner

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string('name15', cookieString);

regexp('name15', cookieString);

lawnchair('name15', cookieString);

simplesplits('name15', cookieString);

CookieHandler().getCookie('name15');

$.cookie("name15")

getStrCookie("name15")

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Revisions

You can edit these tests or add even more tests to this page by appending /edit to the URL. Here’s a list of current revisions for this page:

• Revision 1: published by BrianMB on 1st February 2011
• Revision 3: published by BrianMB on 7th February 2011
• Revision 4: published by BrianMB on 8th February 2011
• Revision 5: published on 22nd May 2011
• Revision 6: published on 22nd May 2011
• Revision 7: published on 29th February 2012
• Revision 8: published on 4th May 2012
• Revision 9: published by taf2 on 19th June 2012
• Revision 10: published on 13th July 2012
• Revision 11: published on 13th July 2012
• Revision 13: published on 16th February 2013
• Revision 14: published on 16th February 2013

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