Error importing ES module with an encoded comma in the URL #40305

Version

v16.10.0

Platform

No response

Subsystem

No response

What steps will reproduce the bug?

// test.mjs
import './foo%2cbar.mjs';

or

// test2.mjs
await import('./foo%2cbar.mjs');

How often does it reproduce? Is there a required condition?

Always.

What is the expected behavior?

Should import a module named "foo,bar.mjs" located in the same folder, if present, or throw an error with code ERR_MODULE_NOT_FOUND.

What do you see instead?

Throws:

TypeError [ERR_INVALID_MODULE_SPECIFIER]: Invalid module "./foo%2cbar.mjs" must not include encoded "/" or "\" characters imported from ./test.mjs

Note that there is no encoded "/" or "\" in "./foo%2cbar.mjs", just an encoded ","!

Additional information

In my understanding, this behavior results from a bug in lib/internal/modules/esm/resolve.js, where the regular expression encodedSepRegEx incorrectly matches an encoded slash or comma ("/" or ",") instead of a slash or backslash.