From 6ba94afb68102f4af433b950088951f1c9fee1db Mon Sep 17 00:00:00 2001
From: Michael Brevard <yonshi29@gmail.com>
Date: Sat, 15 Mar 2025 19:58:34 +0200
Subject: [PATCH] perf: better string operations on fake domain check

---
 index.js | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/index.js b/index.js
index 0d388623c..2724d8f5b 100644
--- a/index.js
+++ b/index.js
@@ -21,11 +21,12 @@ function hostnameFromEmailAddress(email) {
 
 function isFakeDomain(domain, json = false) {
     if (!json) json = static_json_v1
-    for (let dom of Object.keys(json.domains)) {
-        // exact match
-        if (dom === domain.toLowerCase().trim()) return dom
+    const normalizedDomain = domain.toLowerCase().trim()
+    // exact match
+    if (json.domains[normalizedDomain]) return normalizedDomain
+    for (const dom in json.domains) {
         // subdomain match
-        if (domain.search(new RegExp(`.+\\.${dom}`)) === 0) return dom
+        if (new RegExp(`${dom}$`).test(normalizedDomain)) return dom
     }
     return false
 }