hyperscan
RE2
hyperscan | RE2 | |
---|---|---|
25 | 49 | |
4,637 | 8,628 | |
0.5% | 0.5% | |
2.0 | 8.9 | |
5 months ago | 2 days ago | |
C++ | C++ | |
GNU General Public License v3.0 or later | BSD 3-clause "New" or "Revised" License |
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hyperscan
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Ask HN: Regex on a File or Stream
Maybe some other PCRE-compatible implementation offers streaming. For instance, https://www.intel.com/content/www/us/en/developer/articles/t... says it has this feature, but of course given who it's from it may be tied to a single brand of CPU.
github seems to be https://github.com/intel/hyperscan
- Aho-Corasick Algorithm
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Stop deploying web application firewalls
I think of WAFs as an extra safety net. Defense in depth.
The author complained about the performance cost of WAFs in general, but not all WAFs have be structured like ModSecurity. They could for example be based on something like https://github.com/intel/hyperscan and perf is at a very different level.
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Be careful of the examples you use. They stick
Another example of old timey Unix code just breaking things in minor point releases. See https://abi-laboratory.pro/index.php?view=changelog&l=glibc&... and https://github.com/intel/hyperscan/issues/359.
- hypergrep: A new "fastest grep" to search directories recursively for a regex pattern
- Accelerating Regular Expressions with AVX-512 at 1.5 GB/s/core
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GitHub push protection is free for all public repositories
It’s a bespoke scanning setup designed to deal with GitHub’s scale. Under the hood it’s using Intel’s hyperscan as the regex engine.
https://github.com/intel/hyperscan
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RE2 VS hyperscan - a user suggested alternative
2 projects | 17 Mar 2023
Hyperscan is an Intel regular expression library.
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hyperscan VS RE2 - a user suggested alternative
2 projects | 17 Mar 2023
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Show HN: Unblob – extraction suite for 30+ file formats
We are using hyperscan [3] instead of grepping byte sequences with Python, which is orders of magnitudes faster. It can also handle 4Gb+ files because of this which binwalk cannot.
It's used for a year now in production and it's way more precise and faster than binwalk. We are getting less false-positives too, and even if unblob fails to extract everything, we still get meaningful information out of firmwares, where binwalk just failed with no output previously.
[1]: https://github.com/onekey-sec/unblob/blob/main/unblob/handle...
[2]: https://github.com/onekey-sec/unblob/blob/main/unblob/proces...
[3]: https://github.com/intel/hyperscan
RE2
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C Is the Greenest Programming Language
Looking at the benchmark where C++ is worst compared to other languages, it's depending on the library used. I would guess if they used Google's re2 Regex library instead of Boost's, the result would be different.
https://github.com/google/re2
https://github.com/greensoftwarelab/Energy-Languages/blob/ma...
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what does this + do in the regular expression "(^A-Za-z)+"
That page says it just includes "some of the most common special characters", and following the link to the Examples page in turn includes a link to the full list.
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On a Great Interview Question
Python uses backtracking, so this probably isn't O(n), especially with the ability to choose the dictionary.
But with there are non-backtracking matchers which would make this O(n). Here's re2 from https://github.com/google/re2 :
>>> import re2
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RE2 VS hyperscan - a user suggested alternative
2 projects | 17 Mar 2023
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hyperscan VS RE2 - a user suggested alternative
2 projects | 17 Mar 2023
RE2 is a Google regular expression library
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Projects ideas to learn C++/OOP
google's regex library: https://github.com/google/re2
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Regex: is there a difference between * and {0,}, as well as + and {1,}?
I am currently working with Regex, specifically Re2, and was wondering if there is a real difference between the above expressions for repeated sub-regex.
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First release of SPVM::File::Spec - complex regular expressions, file tests, SPVM::Cwd, inheritance
I ported Google RE2, a regular expression library, to SPVM as Resource::Re2, and created SPVM::Regex, a wrapper for it.
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SPVM::File::Basename is released. This is the first module of SPVM using regular expressions.
I searched for I found that there is a Perl compatible regular expression called Google RE2. It is written in C++, and with Google RE2, I can use Perl-compatible regular expressions as a library.
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Ruby 3.2.0 Is from Another Dimension
Yes, but there is an interesting clarification here. RE2 has used the "caching" approach documented in the Ruby bug ticket linked for quite some time (since its birth?): https://github.com/google/re2/blob/954656f47fe8fb505d4818da1...
It is mentioned only briefly in Cox's article on regex matching in the wild. Look for the word "bitstate": https://swtch.com/~rsc/regexp/regexp3.html
I didn't know Perl had implemented this trick too.
The paper[1] cited in the Ruby bug ticket was published very recently. When I first read the Ruby bug ticket, I immediately wondered how they sidestepped the memory use problem. The paper's abstract seems to suggest there is some technique for doing so, as it rebuffs the idea of doing "full" memoization. Alas, I do not have access the paper. (Which is fucking ridiculous.)
[1]: https://ieeexplore.ieee.org/abstract/document/9519427
What are some alternatives?
regex-benchmark - It's just a simple regex benchmark of different programming languages.
compile-time-regular-expressions - Compile Time Regular Expression in C++
go - The Go programming language
semver.c - Semantic version in ANSI C
lunatic - Lunatic is an Erlang-inspired runtime for WebAssembly
Boost.Signals - Boost.org signals2 module
Rusoto - AWS SDK for Rust
libevil - The Evil License Manager
sqlx - 🧰 The Rust SQL Toolkit. An async, pure Rust SQL crate featuring compile-time checked queries without a DSL. Supports PostgreSQL, MySQL, and SQLite.
constexpr-8cc - Compile-time C Compiler implemented as C++14 constant expressions
ripgrep - ripgrep recursively searches directories for a regex pattern while respecting your gitignore
Cppcheck - static analysis of C/C++ code