Hostname must contain at least one char

src/regex.js

@@ -9,7 +9,7 @@ const WhitespaceCommaDotOrEndOfLine = `[${escapeChar}s,.]|$`;
 const number = `[0-9]`;
 
 // Sections
-const hostname = `(${notWhitespaceOrComma}*${escapeChar}.(${validTlds}))`;
+const hostname = `(${notWhitespaceOrComma}+${escapeChar}.(${validTlds}))`;
 const ip = `(${number}{1,3}${escapeChar}.){3}${number}{1,3}`;
 const optionalPortNumber = `(:${number}+)?`;
 const optionalSlash = `(${escapeChar}/(${notWhitespaceCommaOrDot}*)?)?`;

test/non-matches.json

@@ -14,5 +14,9 @@
   {
     "description": "Url with semicolon but no port number",
     "url": "url.com:"
+  },
+  {
+    "description": "TLD with no hostname",
+    "url": ".com"
   }
 ]