Add support for localhost in regex

src/regex.js

@@ -13,6 +13,6 @@ const optionalSlash = `(${escapeChar}/(${notWhitespaceCommaOrDot}*)?)?`;
 const endsWithButDontMatch = `(?=${WhitespaceCommaDotOrEndOfLine})`;
 
 // Build
-const regex = `(${hostname}|${ip})${optionalPortNumber}${optionalSlash}${endsWithButDontMatch}`;
+const regex = `(localhost|${hostname}|${ip})${optionalPortNumber}${optionalSlash}${endsWithButDontMatch}`;
 
 export default new RegExp(regex, 'gi');

test/matches.json

@@ -35,6 +35,14 @@
     "description": "IP address with trailing slash",
     "url": "192.168.0.1/"
   },
+  {
+    "description": "Localhost",
+    "url": "localhost"
+  },
+  {
+    "description": "Localhost with trailing slash",
+    "url": "localhost/"
+  },
   {
     "description": "Url with slug",
     "url": "url.com/slug"