RE2 VS libevil

RE2

• C Is the Greenest Programming Language
  2 projects | news.ycombinator.com | 26 Jan 2024

  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...

• what does this + do in the regular expression "(^A-Za-z)+"
  1 project | /r/googlesheets | 15 Apr 2023

  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.

• On a Great Interview Question
  1 project | news.ycombinator.com | 12 Apr 2023

  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

• RE2 VS hyperscan - a user suggested alternative
  2 projects | 17 Mar 2023
• hyperscan VS RE2 - a user suggested alternative
  2 projects | 17 Mar 2023

  RE2 is a Google regular expression library

• Projects ideas to learn C++/OOP
  4 projects | /r/Cplusplus | 15 Feb 2023

  google's regex library: https://github.com/google/re2

• Regex: is there a difference between * and {0,}, as well as + and {1,}?
  1 project | /r/AskProgramming | 14 Feb 2023

  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.

• First release of SPVM::File::Spec - complex regular expressions, file tests, SPVM::Cwd, inheritance
  2 projects | dev.to | 3 Feb 2023

  I ported Google RE2, a regular expression library, to SPVM as Resource::Re2, and created SPVM::Regex, a wrapper for it.

• SPVM::File::Basename is released. This is the first module of SPVM using regular expressions.
  2 projects | dev.to | 27 Jan 2023

  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.

• Ruby 3.2.0 Is from Another Dimension
  13 projects | news.ycombinator.com | 4 Jan 2023

  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

libevil

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Tracking mentions began in Dec 2020.