Tootfinder

Regex is kind of a nightmare, but it's so satisfying when it finally works.

from my link log —
Solving regex crosswords with Z3.
https://blog.nelhage.com/post/regex-crosswords-z3/
saved 2025-10-21 https://

Escape from Planet Regex - Kotlin to the Rescue
🖖😉 #regex #video

@… #AskFedi I need a regex (for Discord’s AutoMod) that prevents any text in all Unicode “fonts” from being sent. By “Unicode fonts” I mean things like these:

Unicode Font Style Converter - TextEditor
Enter your text in the input field above or click the random text button and see your phrase converted instantly to more than 60 unicode font styles

you can bring down 20% of the internet with a single-character typo in a regex, but you can also destroy a nearly 50 year old bridge with a single incorrectly placed piece of heatshrink
isn't technology beautiful
https://blog.cloudflare.com/details-of-t…

Oh, how glad I am that I told Claude (command-line version) about `rename -n`. Seeing it iterate over half a dozen different regex patterns that might do what I wanted it to do, but were not quite right … lucky it could spot its errors before running the real thing.

Repairing Regex Vulnerabilities via Localization-Guided Instructions
Sicheol Sung, Joonghyuk Hahn, Yo-Sub Han
https://arxiv.org/abs/2510.09037 https://arxi…

Repairing Regex Vulnerabilities via Localization-Guided Instructions
Regular expressions (regexes) are foundational to modern computing for critical tasks like input validation and data parsing, yet their ubiquity exposes systems to regular expression denial of service (ReDoS), a vulnerability requiring automated repair methods. Current approaches, however, are hampered by a trade-off. Symbolic, rule-based system are precise but fails to repair unseen or complex vulnerability patterns. Conversely, large language models (LLMs) possess the necessary generalizabili…

Hypergraph-Guided Regex Filter Synthesis for Event-Based Anomaly Detection
Margarida Ferreira, Victor Nicolet, Luan Pham, Joey Dodds, Daniel Kroening, Ines Lynce, Ruben Martins
https://arxiv.org/abs/2509.06911

Hypergraph-Guided Regex Filter Synthesis for Event-Based Anomaly Detection
We propose HyGLAD, a novel algorithm that automatically builds a set of interpretable patterns that model event data. These patterns can then be used to detect event-based anomalies in a stationary system, where any deviation from past behavior may indicate malicious activity. The algorithm infers equivalence classes of entities with similar behavior observed from the events, and then builds regular expressions that capture the values of those entities. As opposed to deep-learning approaches, t…

100k most used passwords
These are the latest 100k most insecure used (hacked?) passwords. I wonder why at least a minimal regex the first hurdle can stand in the way of the attackers, i.e. apparently has not yet been widely implemented? Am I wrong, or are there reliable sources?
💥

@… it has been ages that I stumbled over a different handling between #MRI and #JRuby but today it has happened. 😉
EDIT: nevermind. I converted the references but I'm still …

RegexPSPACE: A Benchmark for Evaluating LLM Reasoning on PSPACE-complete Regex Problems
Hyundong Jin, Joonghyuk Hahn, Yo-Sub Han
https://arxiv.org/abs/2510.09227 https://…

RegexPSPACE: A Benchmark for Evaluating LLM Reasoning on PSPACE-complete Regex Problems
Large language models (LLMs) show strong performance across natural language processing (NLP), mathematical reasoning, and programming, and recent large reasoning models (LRMs) further emphasize explicit reasoning. Yet their computational limits, particularly spatial complexity constrained by finite context windows, remain poorly understood. While recent works often focus on problems within the NP complexity class, we push the boundary by introducing a novel benchmark grounded in two PSPACE-com…

I wish they'd either make Mastodon filters case-sensitive or allow regex

Regular Expression Indexing for Log Analysis. Extended Version
Ling Zhang, Shaleen Deep, Jignesh M. Patel, Karthikeyan Sankaralingam
https://arxiv.org/abs/2510.10348 https://

Regular Expression Indexing for Log Analysis. Extended Version
In this paper, we present the design and architecture of REI, a novel system for indexing log data for regular expression queries. Our main contribution is an $n$-gram-based indexing strategy and an efficient storage mechanism that results in a speedup of up to 14x compared to state-of-the-art regex processing engines that do not use indexing, using only 2.1% of extra space. We perform a detailed study that analyzes the space usage of the index and the improvement in workload execution time, un…

When you've had enough of automating every little thing and just want to get stuff done and end up manually generating a bunch of (very slow to generate) PDF plots, then concatenate all of them with #ghostScript, then extract the text with #pdf2txt, use a regex in Python to find some numbers and…

@…
EDIT: nevermind. I converted the references but I'm still open to feedback if you have any.
do you have any advice for me?
I'm surely doing something wrong.
https://