o-ai.tech

Mar 24, 2026 · Backend Development

How to Build Lightning‑Fast Regex Search Indexes for Agent‑Powered Code Tools

The article analyses why traditional code‑search techniques struggle with massive monorepos, explores classic and modern indexing methods—including inverted indexes, trigram, suffix arrays, probabilistic masks, and sparse n‑grams—and explains how Cursor’s locally‑executed, memory‑efficient design delivers instant, fresh regex search for AI agents.