Description:
Regex-centric, fast and flexible scanner generator for C++
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Type: Formula
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Tracked Since: Dec 28, 2025
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Links:
Homepage |
formulae.brew.sh
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Category: Developer tools
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Tags:
scanner
generator
regex
c++
lexer
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Install:
brew install re-flex
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About:
ReFlex is a high-performance scanner generator that utilizes regular expressions to create fast lexical analyzers. It stands out by directly generating C++ source code, enabling deep compiler optimizations and eliminating the overhead of state machine interpretation. This results in significantly faster parsing compared to legacy tools like Flex.
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Key Features:
- Generates highly optimized C++ scanner code
- Supports modern Unicode and POSIX/PCRE regex standards
- Zero-dependency output for easy integration
- Significantly faster than traditional scanner generators
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Use Cases:
- Building custom compilers and interpreters
- High-speed log analysis and data extraction
- Network protocol parsing
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Alternatives:
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flex
– ReFlex is generally faster and generates C++ code, whereas flex is the older standard generating C code.
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re2c
– Both generate C/C++ code, but ReFlex offers a more standard regex syntax and higher-level features.
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