[Solved]-Validating Telephone Number in RegEx in React-Reactjs

^\(\d{3}\)\s\d{3}-\d{4}$

This matches the given format exactly

https://regex101.com/r/HBvG3K/6

\( and \) - To escape () characters and match literally  
\s - space character. If there can be more or no spaces then add * next to \s
\d{} - decimal numbers(0-9) followed by quantifier.

let validateSchema = yup.object().shape({
  tel_no: yup
    .string()
    .matches(
      /^\(\d{3}\)\s\d{3}\s-\s\d{4}/g,
      "Telephone number is invalid"
    )
});