Example

var { isEmail } = require("./index");

isEmail("")  --> false, empty

isEmail("123@gmail.com") --> false, begin by number

isEmail(undefined) --> false

isEmail(null) --> false

isEmail("123456") --> false

isEmail("asnak") --> false

isEmail("!#@$FDS$") --> false

isEmail("abc0011@gmail.com") --> true