From 3f27ccad800d7bd910507577953e25373ae26a8f Mon Sep 17 00:00:00 2001
From: Frazer Smith <frazer.dev@icloud.com>
Date: Sun, 5 Jan 2025 13:31:02 +0000
Subject: [PATCH] perf(lib/utils): cache ipv4 regex (#115)

---
 lib/utils.js | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/lib/utils.js b/lib/utils.js
index 173b9fd..2ddc3fc 100644
--- a/lib/utils.js
+++ b/lib/utils.js
@@ -2,9 +2,11 @@
 
 const { HEX } = require('./scopedChars')
 
+const IPV4_REG = /^(?:(?:25[0-5]|2[0-4]\d|1\d{2}|[1-9]\d|\d)\.){3}(?:25[0-5]|2[0-4]\d|1\d{2}|[1-9]\d|\d)$/u
+
 function normalizeIPv4 (host) {
   if (findToken(host, '.') < 3) { return { host, isIPV4: false } }
-  const matches = host.match(/^(?:(?:25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9][0-9]|[0-9])\.){3}(?:25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9][0-9]|[0-9])$/u) || []
+  const matches = host.match(IPV4_REG) || []
   const [address] = matches
   if (address) {
     return { host: stripLeadingZeros(address, '.'), isIPV4: true }