From 4dce9e1270d60b93c37d41b29677227fe2a820bd Mon Sep 17 00:00:00 2001
From: Hamish Willee <hamishwillee@gmail.com>
Date: Mon, 9 Feb 2026 12:00:20 +1100
Subject: [PATCH 1/5] FF148 Legacy RegExp features

---
 javascript/builtins/RegExp.json | 41 +++++++++++++++++++++++++++++++++
 1 file changed, 41 insertions(+)

diff --git a/javascript/builtins/RegExp.json b/javascript/builtins/RegExp.json
index 33a068378de8a9..5a99d682d7bdcd 100644
--- a/javascript/builtins/RegExp.json
+++ b/javascript/builtins/RegExp.json
@@ -161,6 +161,47 @@
               "standard_track": true,
               "deprecated": true
             }
+          },
+          "rexexp_legacy_features": {
+            "__compat": {
+              "description": "`TypeError` when used in `RegExp` subclass or with cross-realm mismatch.",
+              "spec_url": "https://github.com/tc39/proposal-regexp-legacy-features",
+              "support": {
+                "bun": {
+                  "version_added": false
+                },
+                "chrome": {
+                  "version_added": false
+                },
+                "chrome_android": "mirror",
+                "deno": {
+                  "version_added": false
+                },
+                "edge": "mirror",
+                "firefox": {
+                  "version_added": "148"
+                },
+                "firefox_android": "mirror",
+                "nodejs": {
+                  "version_added": false
+                },
+                "oculus": "mirror",
+                "opera": "mirror",
+                "opera_android": "mirror",
+                "safari": {
+                  "version_added": "15.6"
+                },
+                "safari_ios": "mirror",
+                "samsunginternet_android": "mirror",
+                "webview_android": "mirror",
+                "webview_ios": "mirror"
+              },
+              "status": {
+                "experimental": false,
+                "standard_track": true,
+                "deprecated": true
+              }
+            }
           }
         },
         "dotAll": {

From 3fffc5b91b525899c8aa4b5d60ac79b82d70073b Mon Sep 17 00:00:00 2001
From: Hamish Willee <hamishwillee@gmail.com>
Date: Mon, 16 Feb 2026 10:08:36 +1100
Subject: [PATCH 2/5] Update javascript/builtins/RegExp.json

---
 javascript/builtins/RegExp.json | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/javascript/builtins/RegExp.json b/javascript/builtins/RegExp.json
index 5a99d682d7bdcd..d008fd680e9b8e 100644
--- a/javascript/builtins/RegExp.json
+++ b/javascript/builtins/RegExp.json
@@ -165,7 +165,7 @@
           "rexexp_legacy_features": {
             "__compat": {
               "description": "`TypeError` when used in `RegExp` subclass or with cross-realm mismatch.",
-              "spec_url": "https://github.com/tc39/proposal-regexp-legacy-features",
+              "spec_url": "https://github.com/tc39/proposal-regexp-legacy-features#legacy-regexp-features-in-javascript",
               "support": {
                 "bun": {
                   "version_added": false

From 27499c6cd1cc83dcfe764d31855e63df25c78f53 Mon Sep 17 00:00:00 2001
From: Hamish Willee <hamishwillee@gmail.com>
Date: Tue, 17 Feb 2026 09:32:07 +1100
Subject: [PATCH 3/5] Apply suggestions from code review

---
 javascript/builtins/RegExp.json | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/javascript/builtins/RegExp.json b/javascript/builtins/RegExp.json
index d008fd680e9b8e..7a4b4753bd2141 100644
--- a/javascript/builtins/RegExp.json
+++ b/javascript/builtins/RegExp.json
@@ -198,7 +198,7 @@
               },
               "status": {
                 "experimental": false,
-                "standard_track": true,
+                "standard_track": false,
                 "deprecated": true
               }
             }

From 38219dcac9a77652f16177ec56f637abffd94624 Mon Sep 17 00:00:00 2001
From: Hamish Willee <hamishwillee@gmail.com>
Date: Tue, 17 Feb 2026 09:33:34 +1100
Subject: [PATCH 4/5] remove the spec url

---
 javascript/builtins/RegExp.json | 1 -
 1 file changed, 1 deletion(-)

diff --git a/javascript/builtins/RegExp.json b/javascript/builtins/RegExp.json
index 7a4b4753bd2141..93f8b0aab201bd 100644
--- a/javascript/builtins/RegExp.json
+++ b/javascript/builtins/RegExp.json
@@ -165,7 +165,6 @@
           "rexexp_legacy_features": {
             "__compat": {
               "description": "`TypeError` when used in `RegExp` subclass or with cross-realm mismatch.",
-              "spec_url": "https://github.com/tc39/proposal-regexp-legacy-features#legacy-regexp-features-in-javascript",
               "support": {
                 "bun": {
                   "version_added": false

From a7a54e9747047e2e7d26643684f2bcd5edc16534 Mon Sep 17 00:00:00 2001
From: Hamish Willee <hamishwillee@gmail.com>
Date: Fri, 20 Feb 2026 09:48:41 +1100
Subject: [PATCH 5/5] Update javascript/builtins/RegExp.json

Co-authored-by: Claas Augner <495429+caugner@users.noreply.github.com>
---
 javascript/builtins/RegExp.json | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/javascript/builtins/RegExp.json b/javascript/builtins/RegExp.json
index 93f8b0aab201bd..b32b1baf0b791e 100644
--- a/javascript/builtins/RegExp.json
+++ b/javascript/builtins/RegExp.json
@@ -164,7 +164,7 @@
           },
           "rexexp_legacy_features": {
             "__compat": {
-              "description": "`TypeError` when used in `RegExp` subclass or with cross-realm mismatch.",
+              "description": "Throws `TypeError` when used in `RegExp` subclass or with cross-realm mismatch.",
               "support": {
                 "bun": {
                   "version_added": false