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Date: Fri, 8 Feb 2019 09:05:22 +0100
From: magnum <>
Subject: Re: Hyperscan regex 42x the performance of pcre

On 2019-02-07 12:08, Stephen John Smoogen wrote:
> On Thu, 7 Feb 2019 at 06:04, Jason Ellison <> wrote:
>>    After reading performance comparisons of various regex engines... hscan
>> performs 42 times faster than pcre.  I'm curious as to possible performance
>> benefits of including Hyperscan into john.
> Is John sitting a long time in pcre? I mean if you are spending 80
> seconds making hashes and 1 second to regex and you cut it down to 0.1
> second.. does it help any?

JtR doesn't have or use regexes at all, except when built with 
(currently experimental) regex-library but in that case all regex logic 
is in that external lib.

Hyperscan sounds interesting though. Nothing stops us (well except 
manpower) from re-implementing regex mode with that instead.


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