Alternatives

Products that do what Prime Number Regex does

I was messing around representing integers using binary trees, and noticed that a certain tree format makes it trivial to grep for prime numbers. Probably not very novel, but thought y'all might enjoy it. Here's one through sixteen: * (()()) * ((()())()) * (((()())())()) (((()())())(()())) * ((((()())())())()) ((((()())())())(()())) * ((((()())())(()()))()) ((((()())())(()()))(()())) ((((()())())(()()))((()())())) ((((()())())(()()))(((()())())())) * (((((()())())())())()) (((((()())())())())(()())) * (((((()())())())(()()))()) (((((()())())())(()()))(()()))…

1IW
I wrote a book on Python regular expressions▲193
My book titled "Python re(gex)?" is free to download through this weekend [1][2] The book covers both 're' and 'regex' modules, has plenty of examples and chapters also have cheatsheets and exercises. Code snippets, exercises, sample chapters, etc are available on GitHub repo [3] I used pandoc+xelatex [4] to generate the pdf. [1] https://gumroad.com/l/py_regex [2] https://leanpub.com/py_regex [3] https://github.com/learnbyexample/py_regular_expressions [4]…
2019
2IW
I wrote a book on GNU grep and ripgrep▲182
My book on "GNU grep and ripgrep" is free to download today and tomorrow [1][2] Code snippets, example files and sample chapters are available on GitHub [3] The book uses plenty of examples and regular expressions are also covered from scratch. The book is suitable for beginners as well as serves as a reference. Hope you find it useful, I would be grateful for your feedback and suggestions. I used pandoc+xelatex [4] to generate the pdf. [1] https://gumroad.com/l/gnugrep_ripgrep [2] https://leanpub.com/gnugrep_ripgrep [3]…
2019
3GG
Grasp – grep Clojure code using clojure.spec regexes▲123
2020 · github.com
4
/^[a-z0-9_-]{3,16}$/▲106
A podcast about regular expressions
2020
5
Regex library▲276
A curated list of most commonly used regular expressions
2022
6
RegexLearn▲336
Learn RegEx step by step, from zero to advanced
2021
7IC
I Challenge You to a Regex▲5
Are you a regular expression nerd? Challenge your friend to a Regex.
2025 · regex.jordandalton.com
8AN
Algebraic Number Theory in Python 3▲157
2018 · github.com
9
RegexBot▲165
Easily convert natural language to RegEx using AI
2024
10NI
Nevod is easier and faster than RegExp▲150
2019 · nevod.nezaboodka.com
11JR
JavaScript regexp eBook with hundreds of examples and exercises▲10
Hello. I updated my ebook on JavaScript regular expressions [1] today - updates include corrections, additional content, exercises, solutions, etc All my ebooks [2] are currently free to help with quarantine reading. These include GNU grep & ripgrep, GNU sed, GNU awk and three books on regular expressions - Python, Ruby, JavaScript I'd appreciate your feedback and hope the books are useful. Happy learning :) [1] https://github.com/learnbyexample/learn_js_regexp [2] https://learnbyexample.github.io/books/
2020
12RC
Regexp Crash Course▲16
2020 · regexpcrashcourse.com
13PP
Playing Piano with Prime Numbers▲8
I decided to turn prime numbers into a mini piano and see what kind of music they could make. Inspired by: https://news.ycombinator.com/item?id=44888548 Github: https://github.com/neberej/prime-piano
2025 · nabraj.com
14AP
A programming language that uses only parentheses▲55
2012 · github.com
15RW
Regexly – WYSIWYG Regex Playground for JavaScripters▲7
2017 · regexly.chipto.io
16IP
Integer Programming in the Browser▲52
2017 · strandmark.net
17IW
I wrote a book on JavaScript regular expressions▲7
My example based guide on JavaScript regular expressions is free to download through this weekend [1][2] Code snippets, exercises, sample chapters, etc are available on GitHub repo [3] You can also get the book as part of free bundle [4] [1] https://gumroad.com/l/js_regexp [2] https://leanpub.com/js_regexp [3] https://github.com/learnbyexample/learn_js_regexp [4] https://leanpub.com/b/regex
2019
18LI
Lisp in Five Days▲9
Hi HN! I kept hearing about Lisp and why it was special but didn't have a great place to start. I wanted something self-contained that helped me develop intuition rather than fluency. My hope is this is helpful for casual programmers, professionals from other fields who interact with code, or engineers who haven't had much exposure to interpreters or compilers. Hope this helps anyone else who's curious about getting a sense of Lisp and what makes it special with a limited time investment! Feedback or other cool Lisp things welcome :)
2022 · github.com
19FP
FPGA prime finder – discovered a 1,123-digit Proth prime▲5
I built a Proth prime tester on a Zybo Z7-20 FPGA ($200 board) and found a new 1,123-digit prime: 2079 * 2^3718 + 1. Proth primes are numbers of the form k * 2^n + 1. They have a neat property: Proth's theorem gives you a deterministic proof of primality, not just a probabilistic test. If you can find an integer a where a^((p-1)/2) = -1 mod p, the number is proven prime. No "probably" about it. The interesting part is the hardware. The core is a 4096-bit Montgomery CIOS multiplier running on a Zynq-7020. It uses 28 DSP48E1 slices and runs at 74 MHz, doing one full modular multiply in…
Feb 2026 · github.com
20RR
RegexGo – Regex Generator from Examples▲8
You can enter strings to match/not match and the generator will spit out an according regex. It's not 100% accurate, but I feel like this could still be useful in at least getting a starting point when initially trying to make a regex?
2023 · regexgo.com
21XA
Xeger – A semantic regex builder in JavaScript▲14
2015 · github.com
22IR
I rewrote few of the common core string.h functions▲9
I rewrote the most common core string.h functions in pure C. I mostly did it to learn pointers and string. Would love to get any feedbacks:)
2025 · github.com
23HI
HackerSearch.io – GitHub search that supports RegExp▲9
2015 · hackersearch.io
24YC
You can program without loop and recursion and×÷- is all you need▲9
2024 · github.com

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