ocaml-re vs mcilroy-regex

ocaml-re

Pure OCaml regular expressions, with support for Perl and POSIX-style strings (by ocaml)

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mcilroy-regex

Doug McIlroy's C++ regular expression matching library (by arnoldrobbins)

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ocaml-re		mcilroy-regex
	Project
2	Mentions	1
229	Stars	95
2.6%	Growth	-
8.6	Activity	10.0
4 days ago	Latest Commit	over 5 years ago
OCaml	Language	C++
GNU General Public License v3.0 or later	License	GNU General Public License v3.0 or later

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.

ocaml-re

Posts with mentions or reviews of ocaml-re. We have used some of these posts to build our list of alternatives and similar projects. The last one was on 2023-03-07.

Show HN: Regex Derivatives (Brzozowski Derivatives)
10 projects | news.ycombinator.com | 7 Mar 2023

Note that it's not difficult to (lazily or not) build a NFA using derivatives as well (with Antimirov's construction).
[1]: https://github.com/ocaml/ocaml-re/
Super-expressive – Write regex in natural language
4 projects | news.ycombinator.com | 21 Jan 2021

I'm familiar with standard (compact) regex syntax, but I've been using the above syntax recently in a couple small places. I'm a bit on the fence as to which is "better". The compact syntax is, of course, more compact. I think it's a very similar comparison between APL (which I've not used) and most other common programming languages.
One advantage of the expanded syntax is that it's a bit nicer to incorporate a string variable, e.g. "str some_string" vs. "/#{Regexp.escape(some_string)}/" (to borrow Ruby's syntax).
[1] https://github.com/ocaml/ocaml-re

mcilroy-regex

Posts with mentions or reviews of mcilroy-regex. We have used some of these posts to build our list of alternatives and similar projects. The last one was on 2023-03-07.

Show HN: Regex Derivatives (Brzozowski Derivatives)
10 projects | news.ycombinator.com | 7 Mar 2023

What are some alternatives?

When comparing ocaml-re and mcilroy-regex you can also consider the following projects:

google-drive-ocamlfuse - FUSE filesystem over Google Drive

recross-coq - Regexp engine in Coq for solving regexp crosswords

brzozowski - Brzozowski derivative python sketch

super-expressive - 🦜 Super Expressive is a zero-dependency JavaScript library for building regular expressions in (almost) natural language

re1-rust - A port of re1, Russ Cox’s simple, virtual machine–based regular expression engine

agda-regexp-automata - Formalization of Regular Languages in Agda: regular expressions, finite-state automata, proof of equivalence, proof of the pumping lemma.

regexp-Brzozowski - Coq formalization of decision procedures for regular expression equivalence [maintainer=@anton-trunov]

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