---
title: Formal Languages
description: Formal languages study the mathematical syntax, structures, and grammars used to define programming languages and communication protocols. Learners will understand the Chomsky hierarchy, regular expressions, and how parsers interpret code for compilation.
category: programming-tech
subcategory: theoretical-computer-science
difficulty: beginner, intermediate, advanced
url: /subject/formal-languages
---

# Formal Languages

Formal languages study the mathematical syntax, structures, and grammars used to define programming languages and communication protocols. Learners will understand the Chomsky hierarchy, regular expressions, and how parsers interpret code for compilation.

## Available Resources

1 Books • 1 Courses • 2 Websites

## Websites

### 1. Brilliant.org - Theory of Computation

Interactive problems on formal languages

**Difficulty:** Beginner | **Price:** Paid

**Link:** https://brilliant.org/courses/theory-of-computation/

### 2. brilliant.org

Brilliant.org is an online, interactive learning platform offering problem-based courses in math and computer science, including topics in automata theory, computation, and discrete mathematics, with guided lessons and practice problems.

**Difficulty:** Intermediate | **Language:** English | **Price:** Free

**Link:** https://brilliant.org

**Tags:** websites, technology-computer-science, theoretical-computer-science

## Courses

### 1. Theory of Computation

Learn computability theory with Kamala Krithivasan's Theory of Computation course. Explore fundamental concepts and problem-solving!

**Difficulty:** Advanced | **Price:** Free

**Link:** https://nptel.ac.in/courses/106105163

**Tags:** theory-of-computation, automata, turing-machines, formal-languages, decidability

## Books

### 1. Formal Languages and Their Relation to Automata

**Author:** John E. Hopcroft, Jeffrey D. Ullman

The 1969 monograph that organized formal language theory around the Chomsky hierarchy, pairing regular, context-free, context-sensitive and recursively enumerable languages with finite automata, pushdown automata, linear bounded automata and Turing machines. Proof-based; readers learn the classical closure and decidability results.

**Difficulty:** Intermediate | **Language:** English | **Price:** Paid

**Link:** https://www.amazon.com/dp/0201029839?tag=edmonddante07-20

**Tags:** books, technology-computer-science, theoretical-computer-science

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