regexp-Brzozowski
redgrep
| regexp-Brzozowski | redgrep | |
|---|---|---|
| 1 | 4 | |
| 12 | 150 | |
| - | 0.7% | |
| 3.9 | 5.8 | |
| 7 months ago | 3 months ago | |
| Coq | C++ | |
| MIT License | Apache License 2.0 |
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regexp-Brzozowski
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Show HN: Regex Derivatives (Brzozowski Derivatives)
Thanks for sharing. I am not familiar with Agda. Will take a look. There is somewhat similar code in COQ: https://github.com/coq-community/regexp-Brzozowski
redgrep
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Show HN: Regex Derivatives (Brzozowski Derivatives)
I don't think Rust regex engine relies on this technique. I guess the main point is when you construct the DFA directly you still have the possibility of the exponential explosion of the number of states. That's why modern engines balance between NFA/DFA and lazy DFA.
Though there is an implementation that relies only on Brzozowski derivatives: https://github.com/google/redgrep
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Introducing: Pomsky (formerly Rulex)
redgrep did it though: https://github.com/google/redgrep
- Redgrep – grep based on regex derivatives, matches in linear time
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Speed of Rust vs. C
It couldn't figure it out from looking through ripgrep's website: does ripgrep support intersection and complement of expressions? Like eg https://github.com/google/redgrep does.
Regular languages are closed under those operations after all.
What are some alternatives?
analysis - Mathematical Components compliant Analysis Library
ixy-languages - A high-speed network driver written in C, Rust, C++, Go, C#, Java, OCaml, Haskell, Swift, Javascript, and Python
ocaml-re - Pure OCaml regular expressions, with support for Perl and POSIX-style strings
smartstring - Compact inlined strings for Rust.
math-comp - Mathematical Components
libskry_r - Lucky imaging library
recross-coq - Regexp engine in Coq for solving regexp crosswords
barre - A Regular Expression Library and CFG parser for Rust using Brzozski Derivatives
brzozowski - Brzozowski derivative python sketch
fst - Represent large sets and maps compactly with finite state transducers.
re1-rust - A port of re1, Russ Cox’s simple, virtual machine–based regular expression engine
ixy - A simple yet fast user space network driver for Intel 10 Gbit/s NICs written from scratch