我将material-ui-phone-number用于表单的输入字段。我想使用Yup验证电话号码。无论我在该字段中键入什么，它都表明没有输入电话号码。我正在检查应该传递给Yup的字符串的有效性。从文档中可以看出，material-ui-phone-number是Textfield的扩展，因此应该与Yup一起使用。

//Yup

const phoneRegExp = /^((\\+[1-9]{1,4}[ \\-]*)|(\\([0-9]{2,3}\\)[ \\-]*)|([0-9]{2,4})[ \\-]*)*?[0-9]{3,4}?[ \\-]*[0-9]{3,4}?$/

const validationSchema = Yup.object().shape({

    contactFirstName: Yup.string()
        .min(1,"Must have a character")
        .max(255,"Must be shorter than 255")
        .required("Must enter a first name"),contactLastName: Yup.string()
        .min(1,"Must be shorter than 255")
        .required("Must enter a last name")

    contactPhoneNumber: Yup.string()
        .matches(phoneRegExp,"Phone number is not valid")
        .required("Must enter a phone number")

})

export default validationSchema

//ContactInformation.js

    <div classname="contactPhoneNumber">
            <MuiPhoneNumber 
                id="contactPhoneNumber"
                label="Phone Number"
                defaultCountry={"us"}
                variant="filled"
                onChange={handleChange}
                onBlur={handleBlur}
                value={values.contactPhoneNumber}
                classname={touched.contactPhoneNumber && errors.contactPhoneNumber ? "has-error" : null}
               />
            <Error touched={touched.contactPhoneNumber} message={errors.contactPhoneNumber}/>

//EventForm.js

export default function EventForm(){

    return (
        <Formik 
        initialValues={{eventName: "",email: "",}}
        validationSchema={validationSchema}
        onSubmit={(values,{setSubmitting,resetform}) => {
            setTimeout(() => {

                alert(JSON.stringify(values,null,2));

                setSubmitting(false);

            },400);
        }}
        >
            { ({
                values,errors,touched,handleChange,handleBlur,handleSubmit,isSubmitting
            }) => (
            <form onSubmit={handleSubmit}>

                <EventDetails values={values} touched={touched} errors={errors} handleBlur={handleBlur} handleChange={handleChange} />
                <Divider />
                <ContactInformation values={values} touched={touched} errors={errors} handleBlur={handleBlur} handleChange={handleChange} />

                <div classname="submitButton">
                    <Button variant="outlined" type="submit" disabled={isSubmitting} >
                        Submit
                    </Button>
                </div>

            </form>
            )}
        </Formik>
    )

}