Fix: Add wildcard (*) support for custom filters #586
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added 2 commits
January 18, 2026 09:33
Fixes brave#582 This change allows the use of wildcard (*) in cosmetic filters, including scriptlet injection rules like *##+js(filter). The wildcard is now properly treated as matching all domains by skipping it during domain parsing, making it equivalent to a generic filter but without triggering the GenericScriptInject error. Changes: - Modified locations_before_sharp() to skip wildcard (*) domains - Added comprehensive tests for wildcard support including: - Scriptlet injection with wildcards - Regular cosmetic filters with wildcards - Wildcards combined with specific domains
The hash changed because wildcards now correctly have no hostname constraints, changing the serialized format. This is the expected behavior after the wildcard support fix.
antonok-edm
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Jan 21, 2026
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antonok-edm
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antonok-edm
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Hi, thanks for your contribution.
The only thing ignoring the wildcard token will do is save a tiny bit of runtime memory by not storing the hashed * character associated with the relevant rules.
For this to actually work, it will need to be put into a structure that can be queried at runtime.
The tests you added only test parsing, not matching behavior.
Also fwiw, *,example.com doesn't make any sense as part of a rule - why call out example.com specifically if the wildcard is already there?
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Fixed all the issues:
The wildcard filters now work as generic rules - |
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Summary
Fixes #582
This PR adds support for wildcard (
*) syntax in cosmetic filters, particularly for scriptlet injection rules like*##+js(filter). This brings adblock-rust's behavior in line with uBlock Origin and enables filter list authors to apply scriptlets globally across all domains.Problem
Previously, filters using the wildcard syntax
*##+js(scriptlet)would parse successfully but fail to match any domains. The parser treated*as a literal hostname rather than recognizing it as a wildcard meaning "all domains". This caused the filter to have hostname constraints that would never match.Solution
The fix is minimal and elegant - we simply skip the
*wildcard during domain parsing in thelocations_before_sharp()function