handling fallback if error for regex

Is there any better way of doing default to undefined when failed one key in an object?

type({
   some_key: type("string").pipe((v) => myRegex.test(v) ? v : undefined)
})

type({
   some_key: type("string").pipe((v) => myRegex.test(v) ? v : undefined)
})

handling fallback if error for regex - arktype