Write regular expressions in Melody, a language designed to make regex patterns more readable and maintainable.
Melody
Compile readable Melody expressions into regular expressions with this language implementation.
About Melody
Melody is an open-source language that compiles readable expressions into ECMAScript regular expressions. Its stated aim is to make patterns easier to read and maintain than raw regular expressions. The homepage examples show Melody code next to the regex it produces, such as a semantic version pattern that uses named capture groups.
The command-line tool can read input from a file or stdin, write output to a file, and start an interactive REPL. It can also test the compiled regex against a string or a file. A browser playground is linked for trying expressions without installing anything. The homepage states that the examples reflect the currently supported syntax and may change. Pricing is not stated.
Key features
- Compiles Melody expressions into ECMAScript regular expressions
- Quantifiers written in words, such as "some of" and "2 of"
- Named capture groups defined with capture blocks
- Command-line tool that tests a compiled regex against a string or file
- Interactive REPL for trying expressions
- Browser playground for trying expressions
Best for: Developers who write regular expressions and want patterns that are easier to read and maintain.
Good for
- Open source, with the repository publicly available on GitHub
- Aims for patterns that are more readable and maintainable than raw regular expressions
- Includes a command-line tool for testing patterns against strings or files
Watch out for
- The homepage states that the examples are for the currently supported syntax and may change
- The homepage lists prebuilt macOS binaries only; other platforms use Cargo, Homebrew, AUR, Nix, or a source build
Melody at a glance
- Website
- github.com/yoav-lavi/melody
- Category
- Development › Web Development
- Type
- Open-source project
- Pricing
- Not confirmed. Check the site
- Open source
- Yes · Source code
- Language
- English
- Last checked
- Oct 6, 2026 · Online when checked
- Listed
- Oct 5, 2026
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Melody FAQ
How can I install Melody?
The homepage lists installation with Cargo (cargo install melody_cli), building from source, Homebrew, the Arch Linux AUR, and NixOS. Prebuilt binaries are listed for macOS.
Can I test a Melody pattern against sample text?
Yes. The command-line tool has a -t option to test the compiled regex against a string and a -f option to test it against the contents of a file.
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