jflex ☆

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Description:
Lexical analyzer generator for Java, written in Java

Type: Formula | Tracked Since: Dec 28, 2025

Links: Homepage | formulae.brew.sh

Category: Developer tools

Tags: java lexer generator compiler development

Install: brew install jflex

About:
JFlex is a lexical analyzer generator for Java. It generates Java source code for a scanner (lexer) based on a specification that defines patterns. Its main value is automating the tedious process of writing lexers, ensuring correctness and performance.

Key Features:

Generates fast, table-driven scanners
Supports Java code integration within specifications
Compatible with CUP and BYACC/J for parser generation
Detailed error reporting and diagnostics

Use Cases:

Building compilers and interpreters for custom languages
Creating log file parsers or data extractors
Developing syntax highlighting tools for IDEs

Alternatives:

ANTLR – Generates both lexers and parsers; supports multiple target languages.

Version History

Detected	Version	Rev	Change	Commit
Mar 11, 2023 5:04am		0	VERSION_BUMP	7aaf8eb3
Mar 11, 2023 5:04am		0	VERSION_BUMP	3cbae8ce