oniguruma-to-js

Convert Oniguruma-flavor Regexp to JavaScript native RegExp.

Supported Oniguruma features:

• [:alnum:], [:alpha:] etc. POSIX bracket expressions
• (?x) extended, free-spacing mode
• (?i:..) flags modifiers
• (?>..) atomic group via regex
• ..*+ possessive quantifiers via regex
• \h \H hex digit shorthands
• \p{Blank} \p{Print} etc. Oniguruma-flavored unicode property escapes

Usage

1npm i oniguruma-to-js

1import { onigurumaToRegexp } from 'oniguruma-to-js'
2
3const re = onigurumaToRegexp(`[[:alnum:]_]+`)
4console.log(re) // /^[a-zA-Z0-9_]+$/

1import { construct, syntaxLowering } from 'oniguruma-to-js'
2
3const pattern = syntaxLowering(`(?x:
4  \d+    # Match one or more digits
5  \s*    # Match zero or more whitespace characters
6  [A-Z]+ # Match one or more uppercase letters
7)`)
8console.log(pattern) // "\d+\s*[A-Z]+"
9
10const re = construct(pattern)
11console.log(re) // /\d+\s*[A-Z]+/

Additional Features

Lowering TextMate Grammar

Traverse all the regex patterns in a TextMate grammar, and apply syntaxLowering to lower the syntax.

1import { loweringTextmateGrammar } from 'oniguruma-to-js/textmate'
2import grammar from '../path/to/grammars/json.json'
3
4const lowered = loweringTextmateGrammar(grammar)

Note this function will not guarantee the correctness of the result, you may need to verify the result manually.

Sponsors

License

MIT License © 2024-PRESENT Anthony Fu