fosrl.pangolin/server/schemas/subdomainSchema.ts

import { z } from "zod";

export const subdomainSchema = z
    .string()
    .regex(
        /^(?!:\/\/)([a-zA-Z0-9-_]+\.)*[a-zA-Z0-9-_]+$/,
        "Invalid subdomain format"
    )
    .min(1, "Subdomain must be at least 1 character long")
    .transform((val) => val.toLowerCase());