297838 2025-08-24 06:00:53 -0700 dNR: fails to match separator `^` to end of URL in `urlFilter` 2026-05-01 03:16:11 -0700 1 1 1 Unclassified WebKit WebKit Extensions WebKit Nightly Build Mac (Apple Silicon) macOS 15 NEW InRadar P2 Normal --- 1 rhill webkit-unassigned carlosj-webkit-bugzilla dotproto timothy webkit-bug-importer oldest_to_newest 2138520 0 rhill 2025-08-24 06:00:53 -0700 The official DNR documentation[1] (my emphasis): > '^' : Separator character: This matches anything except a letter, a digit, or one of the following: _, -, ., or %. **This also match the end of the URL.** For instance the following filter should visually break the web site `https://arstechnica.com/`: { "action": { "type": "block" }, "condition": { "resourceTypes": [ "stylesheet" ], "urlFilter": "arstechnica.net/wp-content/themes/*.css^" }, "id": 5 } However the stylesheets are not blocked as expected, the following network request is not blocked by the above rule: https://cdn.arstechnica.net/wp-content/themes/ars-v9/public/css/app.6e4698.css The source code comment[2] appears to support that the conversion process does not take into account that `^` should also match end of URL: > // '^' : Separator character: This matches anything except a letter, a digit or one of the following: _ - . %. Note: the above issue can be easily reproduce in the extension uBlock Origin Lite, in which it is possible to directly enter DNR rules after enabling "Develop" option in its dashboard, which will make available a "Custom DNR rules" editor in which the above rule can be copy/pasted. --- [1] https://developer.chrome.com/docs/extensions/reference/api/declarativeNetRequest#type-RuleCondition [2] https://github.com/WebKit/WebKit/blob/c9ff2b60570e45499e67a9cf5d72a7b567850a1f/Source/WebKit/UIProcess/Extensions/Cocoa/_WKWebExtensionDeclarativeNetRequestRule.mm#L1166 2138521 1 webkit-bug-importer 2025-08-24 06:01:24 -0700 <rdar://problem/159049652> 2166801 2 dotproto 2025-12-17 18:23:49 -0800 I'm interested in working on this issue. I am currently setting up my local development environment for WebKit. 2172310 3 dotproto 2026-01-15 13:13:51 -0800 Pull request: https://github.com/WebKit/WebKit/pull/56662