@gocodingnow/rn-tamagui-boilerplate/template/src/helpers/validate.ts

React Native + Tamagui 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;
  }
};