function deserialize(key, value) {

  if (

    Array.isArray(value) &&

    value.length === 3 &&

    value[0] === '<<REGEXP' &&

    value[2] === 'REGEXP>>'

  ) {

    let [, exp, flags] = value[1].match(/\/(.*)\/(.*)?/)

​

    return new RegExp(exp, flags || '')

  }

​

  return value

}

​

function serializer(key, value) {

  if (value instanceof RegExp) {

    return ['<<REGEXP', value.toString(), 'REGEXP>>']

  }

​

  return value

}

​

var original = {

  email: /^j(ohn){0,1}(\.){0,1}doe@example.com$/,

  name: 'John Doe',

  yearOfBirth: 1988

}

​

console.log(original.email.test('john.doe@example.com'))

// > true

​

console.log(original.email.test('jdoe@example.com'))

// > true

​

console.log(original.email.test('jdoe@example.org'))

// > false

​

var serialized = JSON.stringify(original, serializer)

var deserialized = JSON.parse(serialized, deserialize)

​

console.log(deserialized.email.test('john.doe@example.com'))

// > true

​

console.log(deserialized.email.test('jdoe@example.com'))

// > true

​

console.log(deserialized.email.test('jdoe@example.org'))

// > false