@gocodingnow/rn-native-base-boilerplate/template/src/utils/validate.ts

React Native + Native Base Boilerplate

export const isEmail = (email: string) => {
  if (!email) {
    return false
  } else if (!/^[A-Z0-9._%+-]+@[A-Z0-9.-]+\.[A-Z]{2,4}$/i.test(email)) {
    return false
  } else {
    return true
  }
}