perf(lib/utils): cache ipv4 regex (#115)

fastify · Jan 5, 2025 · 3f27cca · 3f27cca
1 parent d983cb0
commit 3f27cca
Showing 1 changed file with 3 additions and 1 deletion.
diff --git 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 }