mathiasbynens/regexpu

Converts ES2015 Unicode regex patterns with the `u` flag into ES5-compatible surrogate pair sequences, handling astral plane characters like emoji through systematic transpilation of regex literals. Integrates directly with major transpilers—Babel, Traceur, Bublé, and esnext—and relies on regjsparser for AST parsing and regenerate for Unicode range generation. Supports both CLI and programmatic API usage, though it doesn't handle dynamic RegExp constructors or complex edge cases like lone surrogates.

240 stars and 948,616 monthly downloads. No commits in the last 6 months. Available on npm.