Hi @gitcrimes! I'm Dosu and I'm helping the Zod team.

The issue is that z.regex() is not a schema type — it's a check function meant to validate strings against a pattern [1]. That's why you get the TypeError: option._zod.run is not a function error when passing it into z.xor(), which expects actual schemas.

To accept an actual RegExp instance, use z.instanceof(RegExp) [2]:

import * as z from "zod/mini";

const schema = z.strictObject({
  url: z.union([z.string(), z.instanceof(RegExp)]),
});

z.instanceof() validates that the value is an instance of the given class [3], so it'll accept /foo/ or new RegExp("foo") but reject plain strings and other types.

If you only want exactly one of the options to match (the xor semantics), you can swap z.union for z.xor:

url: z.xor([z.string(), z.instanceof(RegExp)])

Both work fine with z.instanceof() since it's a proper schema [4].

Feel free to close this discussion if that answers your question!

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