diff --git a/src/js/node/net.js b/src/js/node/net.js
index 12d7cf08b4..52d9bbd45f 100644
--- a/src/js/node/net.js
+++ b/src/js/node/net.js
@@ -25,29 +25,29 @@ const EventEmitter = require("node:events");
 // IPv4 Segment
 const v4Seg = "(?:[0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])";
 const v4Str = `(${v4Seg}[.]){3}${v4Seg}`;
-const IPv4Reg = new RegExp(`^${v4Str}$`);
+var IPv4Reg;
 
 // IPv6 Segment
 const v6Seg = "(?:[0-9a-fA-F]{1,4})";
-const IPv6Reg = new RegExp(
-  "^(" +
-    `(?:${v6Seg}:){7}(?:${v6Seg}|:)|` +
-    `(?:${v6Seg}:){6}(?:${v4Str}|:${v6Seg}|:)|` +
-    `(?:${v6Seg}:){5}(?::${v4Str}|(:${v6Seg}){1,2}|:)|` +
-    `(?:${v6Seg}:){4}(?:(:${v6Seg}){0,1}:${v4Str}|(:${v6Seg}){1,3}|:)|` +
-    `(?:${v6Seg}:){3}(?:(:${v6Seg}){0,2}:${v4Str}|(:${v6Seg}){1,4}|:)|` +
-    `(?:${v6Seg}:){2}(?:(:${v6Seg}){0,3}:${v4Str}|(:${v6Seg}){1,5}|:)|` +
-    `(?:${v6Seg}:){1}(?:(:${v6Seg}){0,4}:${v4Str}|(:${v6Seg}){1,6}|:)|` +
-    `(?::((?::${v6Seg}){0,5}:${v4Str}|(?::${v6Seg}){1,7}|:))` +
-    ")(%[0-9a-zA-Z-.:]{1,})?$",
-);
+var IPv6Reg;
 
 function isIPv4(s) {
-  return IPv4Reg.test(s);
+  return (IPv4Reg ??= new RegExp(`^${v4Str}$`)).test(s);
 }
 
 function isIPv6(s) {
-  return IPv6Reg.test(s);
+  return (IPv6Reg ??= new RegExp(
+    "^(" +
+      `(?:${v6Seg}:){7}(?:${v6Seg}|:)|` +
+      `(?:${v6Seg}:){6}(?:${v4Str}|:${v6Seg}|:)|` +
+      `(?:${v6Seg}:){5}(?::${v4Str}|(:${v6Seg}){1,2}|:)|` +
+      `(?:${v6Seg}:){4}(?:(:${v6Seg}){0,1}:${v4Str}|(:${v6Seg}){1,3}|:)|` +
+      `(?:${v6Seg}:){3}(?:(:${v6Seg}){0,2}:${v4Str}|(:${v6Seg}){1,4}|:)|` +
+      `(?:${v6Seg}:){2}(?:(:${v6Seg}){0,3}:${v4Str}|(:${v6Seg}){1,5}|:)|` +
+      `(?:${v6Seg}:){1}(?:(:${v6Seg}){0,4}:${v4Str}|(:${v6Seg}){1,6}|:)|` +
+      `(?::((?::${v6Seg}){0,5}:${v4Str}|(?::${v6Seg}){1,7}|:))` +
+      ")(%[0-9a-zA-Z-.:]{1,})?$",
+  )).test(s);
 }
 
 function isIP(s) {