Rule with id XX specified a more complex regex than allowed as part of the regexFilter key

[Don Schmitt]

According to the declarativeNetRequest docs, this error will only happen if a compiled regex is more than 2KB.

I am getting this error on the following regex, which doesn't look terribly complex to me, am I missing something obvious or do you think this is a bug?

CONSOLE LOG:

adding rule id: 3, rule: https:\/\/.*\.blahblah\.net\/test_demo\/generic2\/STRUTS\/callStrutsSecure\.jsp\?app=coupons&bridge=\/COUPONPROMO\/coupon_bridge\.jsp

ERROR:

Uncaught (in promise) Error: Rule with id 3 specified a more complex regex than allowed as part of the "regexFilter" key.

[Patrick Kettner]

Hey Don!

Could you file a bug on crbug.com with reproducible steps?

thanks!

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[Don Schmitt]

Hi Patrick,

Okay, I found a related bug, 

https://bugs.chromium.org/p/chromium/issues/detail?id=1309190

that I think covers it.  It appears you can't have a regex over 111 characters long, much less than the 2KB compiled size in the docs:  https://bugs.chromium.org/p/chromium/issues/detail?id=1309190

This seems like a significant bug and it is an MV3 showstopper for us, but it hasn't been touched all year, any way to bump the priority?

Thanks!

--

Don

[Patrick Kettner]

Hi Don

Just to clarify, the 2kb limit is for the entire rule. I will reach out to the engineering team to see if there is anything that can be done on crbug.com/316597968

[Patrick Kettner]

Apologies I meant crbug.com/1309190

[wOxxOm]

This particular case can be expressed via "urlFilter": "||blahblah.net/test_demo/generic2/STRUTS/callStrutsSecure.jsp?app=coupons&bridge=/COUPONPROMO/coupon_bridge.jsp"

[Nina Bobo]

https://community.windy.com/user/baduthoki77
https://nowewyrazy.uw.edu.pl/profil/baduthoki77

http://forum.yealink.com/forum/member.php?action=profile&uid=298597

https://vocal.media/authors/baduthoki77
https://www.veoh.com/users/baduthoki77

[Don Schmitt]

Sheesh, these examples are so simple, I'm really surprised adblockers aren't running into this. In our case, IT departments are adding the URL filters, often by copy / paste, so a 112-character filter would not be an outlier at all.

Is there a way in crbug to tag something as "MV3 blocker"?

[wOxxOm]

A temporary workaround is to write a converter for such cases.

[Don Schmitt]

Sorry, I don't grok.  A converter?  Can you elaborate?

[wOxxOm]

It's possible to convert such patterns that don't use advanced regex features to urlFilter syntax. You can write such a converter.

[Don Schmitt]

Oh!  Thanks for the suggestion, I thought you were originally implying that this bug would _also_ happen with urlFilter not that urlFilter could be used as a workaround.  Yeah, this particular case could be converted to urlFilter, but that can't be algorithmically done with any possible user regex filter input, which is what we have implemented now with MV2 webRequestBlocking.