JAVASCRIPT

joi regex validate

Joi.string().regex(/^[a-zA-Z0-9_][a-zA-Z0-9_.]*/)

joi validate

const schema = Joi.object({
    username: Joi.string()
        .alphanum()
        .min(3)
        .max(30)
        .required(),

});
schema.validate({ username: 'abc', birth_year: 1994 });