Melody is a language designed to compile to and maintain a 1-1 relationship with regular expressions, while being more readable and maintainable.

The current goal is supporting the JavaScript implementation of regular expressions.

⚠️ Melody is very new and is unstable at the moment ⚠️

Examples

Note: these are for the currently supported syntax and may change

Batman Theme

16 of "na";

2 of match {
  space>;
  "batman";
}

// 🦇🦸‍♂️

Turns into

/(?:na){16}(?:sbatman){2}/

Twitter Hashtag

"#";
some of word>;

// #melody

Turns into

Introductory Courses

some of word>;
space>;
"1";
2 of digit>;

// classname 1xx

Turns into

Install

From Source

git clone https://github.com/yoav-lavi/melody.git
cd melody
cargo install --path .

CLI Usage

melody [OPTIONS] PATH>

OPTIONS:
  -f, --file FILE>    write to an output file
  -n, --no-color       print output with no color
  -V, --version        print version information
  -h, --help           print help information

Keywords

• of – used after a number or a range and before a sequence to be matched, e.g. 5 of "A";, equivalent to regex {5}
• to – used to create a range (either as a quantifier or as a character range), e.g. 5 to 9, equivalent to regex {5,9} if before an of or [5-9] otherwise
• capture – used to open a capture or named capture block, equivalent to regex (...)
• match – used to open a match block, equivalent to regex (?:...)
• start – matches the start of the string, equivalent to regex ^
• end – matches the end of the string, equivalent to regex $
• char – matches a single character, equivalent to regex .
• some – used with of to express 1 or more of a pattern, equivalent to regex +

Symbols

• – equavalent to regex s
• – equavalent to regex n
• – equavalent to regex t
• – equavalent to regex r
• – equavalent to regex f
• – equavalent to regex
• – equavalent to regex d
• – equavalent to regex v
• – equavalent to regex w

Concepts

• "..." or '...' – used to mark a literal part of the match

Extras

• // – used to mark comments

File Extension

The Melody file extension is .mdy

Feature Status

✅ – Implemented

🐣 – Partially implemented

❌ – Not implemented

❓ – Unclear whether this will be implemented

❔ – Unclear what the syntax will be