---
title: "Regex"
description: "2 posts about Regex, summarised, each linking to the original."
---

# Regex
> 2 posts about Regex, summarised, each linking to the original.

## Articles

### [Glyph: A Multi-Strategy Agentic System for Column Description and Sensitivity-Ontology Tagging of Enterprise Data Catalogs](https://yomu.fyi/post/glyph-a-multi-strategy-agentic-system-for-column-description-and-sensi.md)
- Company: [Apple](https://yomu.fyi/company/apple.md)
- Published: Sep 16, 2026
- Type: Explainer

Glyph addresses enterprise data lakes where tables accumulate faster than human stewards can document or classify them, leaving column descriptions and governance labels incomplete. It models column description generation and sensitivity-ontology tagging as cooperating LLM agents orchestrated as stateful graphs. The Descriptor uses active Retrieval-Augmented Generation to retrieve pipeline source code from an enterprise GitHub, while the Tagger runs description, line-of-business regex, and metadata strategies in parallel before combining ranked outputs with Reciprocal Rank Fusion. A fine-tuned six-layer MiniLM metadata encoder raised same-tag retrieval on an in-distribution held-out split from NDCG@10 0.55 to 0.92 and MAP@100 0.19 to 0.90, relative to the stock base encoder. Glyph also evaluates end-to-end multilabel tagging with a recall-weighted F2 objective across three groups and an ablation, emphasizing value-free, code-grounded operation, per-tag provenance, and graceful degradation for auditable production cataloging.


### [Fast regex search: indexing text for agent tools](https://yomu.fyi/post/fast-regex-search-indexing-text-for-agent-tools.md)
- Company: [Cursor](https://yomu.fyi/company/cursor.md)
- Author: Vicent Marti
- Published: Mar 23, 2026
- Type: Explainer

Agentic coding has revived grep as a critical way to gather source-code context, but ripgrep can stall on large monorepos because it scans every file. The proposed remedy is a local inverted index of overlapping character trigrams, with regular expressions parsed into required and alternative trigram constraints that narrow candidate files before exact matching. The index stores posting lists in one disk file and a sorted hash-to-offset lookup table in another, memory-mapping only the table for binary-search lookups; hash collisions can broaden results but cannot produce incorrect ones. Freshness is prioritized because agents often search for text they have just written, and the client index layers user and agent changes over a Git commit. The reported conclusion is that instant local search creates qualitative workflow improvements, especially for bug investigation and large Enterprise repositories.