regex-automata VS const-eval

Compare regex-automata vs const-eval and see what are their differences.

regex-automata

A low level regular expression library that uses deterministic finite automata. (by BurntSushi)

const-eval

home for proposals in and around compile-time function evaluation (by rust-lang)
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regex-automata const-eval
5 6
349 99
- -
0.0 3.8
10 months ago 9 months ago
Rust CSS
The Unlicense Apache License 2.0
The number of mentions indicates the total number of mentions that we've tracked plus the number of user suggested alternatives.
Stars - the number of stars that a project has on GitHub. Growth - month over month growth in stars.
Activity is a relative number indicating how actively a project is being developed. Recent commits have higher weight than older ones.
For example, an activity of 9.0 indicates that a project is amongst the top 10% of the most actively developed projects that we are tracking.

regex-automata

Posts with mentions or reviews of regex-automata. We have used some of these posts to build our list of alternatives and similar projects. The last one was on 2023-04-20.
  • regex 1.8.0 released (no-op escapes allowed, (?<name>re) syntax added)
    4 projects | /r/rust | 20 Apr 2023
    I believe you're the second person to tell me they were confused by this, so there are probably several others confused but didn't say anything. I've added a warning to the top of regex-automata's README.
  • After years of work and discussion, `once_cell` has been merged into `std` and stabilized
    6 projects | /r/rust | 30 Mar 2023
    For anyone following along at home, we're having a very helpful discussion about the implementation I posted in my sibling comment here: https://github.com/BurntSushi/regex-automata/issues/30
  • Pomsky 0.8 released: A powerful and modern regular expression language
    1 project | /r/rust | 22 Dec 2022
    My current technique only gets applied to alternations of simple literals. But the idea is generalizeable and I speculate that it is actually impactful to generalize it.
  • Rust: A Critical Retrospective
    19 projects | news.ycombinator.com | 19 May 2022
    (I could use '_ => {}' instead of 'None' to save a few more.)

    I do find the 'if let' variant to be a bit easier to read. It's optimizing for a particular and somewhat common case, so it does of course overlap with 'match'. But I don't find this particular overlap to be too bad. It's usually pretty clear when to use one vs the other.

    But like I said, I could live without 'if let'. It is not a major quality of life enhancement to me. Neither will its impending extensions. i.e., 'if let pattern = foo && some_booolean_condition {'.

    [1]: https://github.com/BurntSushi/regex-automata/blob/fbae906823...

    [2]: https://github.com/BurntSushi/regex-automata/blob/fbae906823...

  • Memchr 2.4 now has an implementation of substring search on arbitrary bytes
    7 projects | /r/rust | 3 May 2021
    (The work on regex-automata 0.2 has been underway for over a year now.](https://github.com/BurntSushi/regex-automata/tree/ag/work) There's a lot done, but still a lot more to go. Once that's done, regex proper should be pretty close to a thin layer that glues regex-syntax, regex-automata, memchr and aho-corasick together. I don't currently expect regex to grow any more dependencies than that. And as it is, aho-corasick and memchr are both optional dependencies. Right now, regex-syntax is the only required dependency, but regex-automata will be added to that list.

const-eval

Posts with mentions or reviews of const-eval. We have used some of these posts to build our list of alternatives and similar projects. The last one was on 2023-03-30.

What are some alternatives?

When comparing regex-automata and const-eval you can also consider the following projects:

pomsky - A new, portable, regular expression language

metrics

regex - An implementation of regular expressions for Rust. This implementation uses finite automata and guarantees linear time matching on all inputs.

bad_actor_poc

grex - A command-line tool and Rust library with Python bindings for generating regular expressions from user-provided test cases

ledger-filecoin-rs

rust-memchr - Optimized string search routines for Rust.

tokio - A runtime for writing reliable asynchronous applications with Rust. Provides I/O, networking, scheduling, timers, ...

biscuit - Biscuit research OS

The-Spiral-Language - Functional language with intensional polymorphism and first-class staging.

re2 - R interface to Google re2 (C++) regular expression engine

maud - :pencil: Compile-time HTML templates for Rust