diff --git a/lib/url.js b/lib/url.js
index 50126ae9bfc4d0..319050ca1530e5 100644
--- a/lib/url.js
+++ b/lib/url.js
@@ -45,6 +45,15 @@ const unwise = ['{', '}', '|', '\\', '^', '`'].concat(delims);
 // Allowed by RFCs, but cause of XSS attacks.  Always escape these.
 const autoEscape = ['\''].concat(unwise);
 
+
+const slashPattern = /\\/g;
+
+const userAtHostPattern = /^\/\/[^@\/]+@[^@\/]+/;
+
+const colonPattern = /%3A/i;
+
+const pathnameEscapePattern = /[?#]/g;
+
 // Characters that are never ever allowed in a hostname.
 // Note that any invalid chars are also handled, but these
 // are the ones that are *expected* to be seen, so we fast-path them.
@@ -97,9 +106,9 @@ Url.prototype.parse = function(url, parseQueryString, slashesDenoteHost) {
   var queryIndex = url.indexOf('?'),
       splitter =
           (queryIndex !== -1 && queryIndex < url.indexOf('#')) ? '?' : '#',
-      uSplit = url.split(splitter),
-      slashRegex = /\\/g;
-  uSplit[0] = uSplit[0].replace(slashRegex, '/');
+      uSplit = url.split(splitter);
+
+  uSplit[0] = uSplit[0].replace(slashPattern, '/');
   url = uSplit.join(splitter);
 
   var rest = url;
@@ -142,7 +151,7 @@ Url.prototype.parse = function(url, parseQueryString, slashesDenoteHost) {
   // user@server is *always* interpreted as a hostname, and url
   // resolution will treat //foo/bar as host=foo,path=bar because that's
   // how the browser resolves relative URLs.
-  if (slashesDenoteHost || proto || rest.match(/^\/\/[^@\/]+@[^@\/]+/)) {
+  if (slashesDenoteHost || proto || rest.match(userAtHostPattern)) {
     var slashes = rest.substr(0, 2) === '//';
     if (slashes && !(proto && hostlessProtocol[proto])) {
       rest = rest.substr(2);
@@ -362,7 +371,7 @@ Url.prototype.format = function() {
   var auth = this.auth || '';
   if (auth) {
     auth = encodeURIComponent(auth);
-    auth = auth.replace(/%3A/i, ':');
+    auth = auth.replace(colonPattern, ':');
     auth += '@';
   }
 
@@ -406,7 +415,7 @@ Url.prototype.format = function() {
   if (hash && hash.charAt(0) !== '#') hash = '#' + hash;
   if (search && search.charAt(0) !== '?') search = '?' + search;
 
-  pathname = pathname.replace(/[?#]/g, function(match) {
+  pathname = pathname.replace(pathnameEscapePattern, function(match) {
     return encodeURIComponent(match);
   });
   search = search.replace('#', '%23');