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@bablr/language-en-regex-vm-pattern

v0.11.0

Published

A BABLR language for nonbacktracking JS-style regexes

Vulnerabilities

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Links

Git

Maintainers

conartist6conartist6stirlhossstirlhoss

Keywords

bablr-languagegrammarenglishregex

Readme

@bablr/language-en-regex-vm-pattern

This BABLR grammar defines a subset of regex that is safe to use in a nonbacktracking regex engine, in particular @bablr/regex-vm.

The language

The language is the same as Javascript Regex except for these deifferences:

  • Expressions always use "unicode mode" escaping rules. Only valid escapes are syntactically legal.

  • Expressions do not support lookbehind (/(?<=abc)/ and /(?<!abc)/).

  • Expressions do not (and will not) support backreferences (/(.)\0/).

  • Expressions do not support lookahead (yet) (/(?=abc)/ and /(?!abc)/). See #11.

  • Expressions do not support named capture groups (/(?<name>)/) (yet).