errors: improve classRegExp in errors.js

PR-URL: nodejs#49643
Reviewed-By: Yagiz Nizipli <yagiz@nizipli.com>
Reviewed-By: LiviaMedeiros <livia@cirno.name>
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>

benchmark/error/error-class-reg-exp.js

@@ -0,0 +1,23 @@
+'use strict';
+
+const common = require('../common.js');
+
+const bench = common.createBenchmark(main, {
+  n: [1e5],
+}, {
+  flags: ['--expose-internals'],
+});
+
+const instances = Array.from({ length: 1000 }).map(() => 'Uint8Array');
+
+function main({ n }) {
+  const {
+    codes: {
+      ERR_INVALID_ARG_TYPE,
+    },
+  } = require('internal/errors');
+  bench.start();
+  for (let i = 0; i < n; ++i)
+    new ERR_INVALID_ARG_TYPE('target', instances, 'test');
+  bench.end(n);
+}

lib/internal/errors.js

@@ -66,7 +66,8 @@ const isWindows = process.platform === 'win32';
 const messages = new SafeMap();
 const codes = {};
 
-const classRegExp = /^([A-Z][a-z0-9]*)+$/;
+const classRegExp = /^[A-Z][a-zA-Z0-9]*$/;
+
 // Sorted by a rough estimate on most frequently used entries.
 const kTypes = [
   'string',