Formal language
A formal language is a set of strings over an alphabet defined by explicit rules for forming valid expressions and, optionally, interpreting them.
Natural Language Processing in Action, Second Edition
A formal language is a language defined by strict rules specifying how valid statements are composed and interpreted.
- How it is used
- Uses strict symbol patterns to recognize commands, trigger actions, and support chatbot dialogue.
- How deep it goes
- Defines grammars, matching, extraction, and finite-state machines, while deferring detailed FSM theory and mathematics.
- Examples
- Uses lock sequences, chatbot greetings, search matching, grep, and pattern-based chatbot systems as concrete examples.
- What you can do after
- Apply it via regular expressions to match phrases, extract information, and trigger scripted responses.
Read how Natural Language Processing in Action, Second Edition explains formal language →
Data Analysis with LLMs
A formal language is a language defined by explicit symbols and grammatical rules for expressing structured statements to computational systems.
- How it is used
- Connects natural-language questions to specialized tools by translating them into tool-specific queries or code.
- How deep it goes
- Explains query translation, database-structure prompts, and query checking, but does not detail language syntax or internals.
- Examples
- Uses a product-review table with review IDs, satisfaction flags, and product categories as a structured-data example.
- What you can do after
- Apply it via a language model to translate a question and database structure into a query, then check the query before execution.
Related concepts
- natural languagecontrasts with · Natural language is a human language that develops through social use and is used for communication, in spoken or written form.
- language modelproduced by · A language model is a computational model that represents patterns in linguistic tokens to estimate sequence probabilities and predict or generate language from context.
- regular expressionuses · A formal pattern notation that describes sets of strings and enables text to be matched, searched, extracted, or transformed.
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