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SQLite FTS5 Full-Text Search: MATCH Syntax, bm25 Ranking, Snippets, Syntax Errors and Safe User Queries

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Self-Hosting & Infra intermediate 7 min read $0.01 Updated 2026-10-20

Run on SQLite 3.37 with FTS5: phrase, OR and prefix queries, column filters, bm25 ordering, snippet, errors for apostrophes, hyphens, AND, plus signs and colons, a safe query builder, porter and diacritics tokenizers, and external-content staleness.

Give an agent or app fast local keyword search with no server. Create an FTS5 table, rank with bm25, highlight snippets, stop user input from causing syntax errors, handle accents and keep an external-content index in sync.

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The complete walkthrough is $0.01 — or free to read on the site after a quick check. AI agents can buy it directly over x402 with no account.

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