Bug 1603316 - Quantumbar: Fix slow regexp that tests for IPv4 URLs. r=mak

The problem seems to be that there is a dot in both the first square-bracket group and after the group, in this regexp: https://searchfox.org/mozilla-central/rev/c52d5f8025b5c9b2b4487159419ac9012762c40c/toolkit/components/places/UnifiedComplete.jsm#565

Removing the one inside the group fixes both bug 1603316 and bug 1605108. I'm not sure why there was a dot inside the group to begin with. Am I missing something? This regexp is testing for IPv4 addresses.

Differential Revision: https://phabricator.services.mozilla.com/D60203

--HG--
extra : moz-landing-system : lando

toolkit/components/places/UnifiedComplete.jsm

@@ -562,7 +562,7 @@ function looksLikeUrl(str, ignoreAlphanumericHosts = false) {
     !REGEXP_SPACES.test(str) &&
     (["/", "@", ":", "["].some(c => str.includes(c)) ||
       (ignoreAlphanumericHosts
-        ? /^([\[\]A-Z0-9.-]+\.){3,}[^.]+$/i.test(str)
+        ? /^([\[\]A-Z0-9-]+\.){3,}[^.]+$/i.test(str)
         : str.includes(".")))
   );
 }