Regex Based Pattern Matching And Text Extraction

via “regex-based generation with pattern matching”

Microsoft's language for efficient LLM control flow.

Unique: Converts regex patterns into grammar constraints (RegexNode) that guide token-by-token generation, ensuring output matches the pattern without post-processing. Uses the regex engine to validate token sequences in real-time during generation.

vs others: More efficient than regex validation after generation because invalid tokens are prevented from being produced, and more flexible than hardcoded format strings because arbitrary regex patterns can be used.