From 06d20084911858b2fcebeb49fce72a2026cbd73c Mon Sep 17 00:00:00 2001
From: sepro <sepro@sepr0.com>
Date: Wed, 26 Mar 2025 18:09:16 +0100
Subject: [PATCH] [jsinterp] Improve nested attribute support

---
 test/test_jsinterp.py | 2 ++
 yt_dlp/jsinterp.py    | 2 +-
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/test/test_jsinterp.py b/test/test_jsinterp.py
index d3076298cc..17184d5b0d 100644
--- a/test/test_jsinterp.py
+++ b/test/test_jsinterp.py
@@ -403,6 +403,8 @@ class TestJSInterpreter(unittest.TestCase):
         test_result = list('test')
         tests = [
             'function f(a, b){return a.split(b)}',
+            'function f(a, b){return a["split"](b)}',
+            'function f(a, b){let x = ["split"]; return a[x[0]](b)}',
             'function f(a, b){return String.prototype.split.call(a, b)}',
             'function f(a, b){return String.prototype.split.apply(a, [b])}',
         ]
diff --git a/yt_dlp/jsinterp.py b/yt_dlp/jsinterp.py
index d46b78f64f..5e452aa674 100644
--- a/yt_dlp/jsinterp.py
+++ b/yt_dlp/jsinterp.py
@@ -614,7 +614,7 @@ class JSInterpreter:
             )|(?P<indexing>
                 (?P<in>{_NAME_RE})\[(?P<idx>.+)\]$
             )|(?P<attribute>
-                (?P<var>{_NAME_RE})(?:(?P<nullish>\?)?\.(?P<member>[^(]+)|\[(?P<member2>[^\]]+)\])\s*
+                (?P<var>{_NAME_RE})(?:(?P<nullish>\?)?\.(?P<member>[^(]+)|\[(?P<member2>[^\[\]]+(?:\[[^\[\]]+(?:\[[^\]]+\])?\])?)\])\s*
             )|(?P<function>
                 (?P<fname>{_NAME_RE})\((?P<args>.*)\)$
             )''', expr)