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AI Engineering Academy · Lesson

Extracting Data from Unstructured Text

Build an information extraction pipeline that reads raw text such as emails, receipts, and articles and returns structured fields with types, defaults, and validation.

The Information Extraction Problem

Organizations are drowning in unstructured text: emails, support tickets, contracts, invoices, news articles, medical notes, and social media posts. Valuable structured data is buried in this text, but extracting it manually is slow, expensive, and error-prone. LLMs with structured outputs change this: they can read any text and populate a predefined schema with the relevant fields, at scale, with reasonable accuracy.

Information extraction (IE) is the process of automatically identifying and pulling structured facts from unstructured text. LLM-based IE dramatically outperforms earlier rule-based or classical NLP approaches because LLMs understand context, synonymy, and implicit information without needing hand-crafted regex patterns for every variation.

Common Extraction Use Cases

Information extraction powers many valuable business applications:

  • Invoice processing: Extract vendor, line items, amounts, and due dates from PDF invoices for accounts payable automation
  • Contract analysis: Extract parties, effective dates, payment terms, and termination clauses from legal documents
  • Resume parsing: Extract skills, experience, education, and contact info from CVs for ATS systems
  • Support ticket routing: Extract category, severity, affected product, and customer tier to route tickets automatically
  • News monitoring: Extract entities, events, and sentiments from news articles for competitive intelligence

All lessons in this course

  1. JSON Mode and response_format
  2. Structured Outputs with Pydantic
  3. Extracting Data from Unstructured Text
  4. Validating and Retrying Bad Outputs
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