redgrep
brzozowski
| redgrep | brzozowski | |
|---|---|---|
| 4 | 4 | |
| 150 | 82 | |
| 0.7% | - | |
| 5.8 | 5.5 | |
| 2 months ago | about 1 month ago | |
| C++ | Python | |
| Apache License 2.0 | - |
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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.
brzozowski
What are some alternatives?
ixy-languages - A high-speed network driver written in C, Rust, C++, Go, C#, Java, OCaml, Haskell, Swift, Javascript, and Python
recross-coq - Regexp engine in Coq for solving regexp crosswords
smartstring - Compact inlined strings for Rust.
regexp-Brzozowski - Coq formalization of decision procedures for regular expression equivalence [maintainer=@anton-trunov]
libskry_r - Lucky imaging library
mcilroy-regex - Doug McIlroy's C++ regular expression matching library
barre - A Regular Expression Library and CFG parser for Rust using Brzozski Derivatives
ocaml-re - Pure OCaml regular expressions, with support for Perl and POSIX-style strings
fst - Represent large sets and maps compactly with finite state transducers.
agda-regexp-automata - Formalization of Regular Languages in Agda: regular expressions, finite-state automata, proof of equivalence, proof of the pumping lemma.
ixy - A simple yet fast user space network driver for Intel 10 Gbit/s NICs written from scratch
re1-rust - A port of re1, Russ Cox’s simple, virtual machine–based regular expression engine