@safejs/serializer/src/serializers/regexp/regexp.ts

Serializer is a superset of JSON that includes recursive objects, dates, regular expressions, functions and others which you also can expand by yourself

import { ExtraSerializer } from "../../types";

export const regExpSerializer: ExtraSerializer<RegExp, [string, string]> = {
    determine: (v) => v instanceof RegExp,
    serialize: (v) => [v.source, v.flags],
    deserialize: ([source, flags]) => new RegExp(source, flags),
};