Kotlin regex email validator function

EmailValidator.kt

fun isEmailValid(email: String): Boolean {
  return Pattern.compile(
    "^(([\\w-]+\\.)+[\\w-]+|([a-zA-Z]|[\\w-]{2,}))@"
    + "((([0-1]?[0-9]{1,2}|25[0-5]|2[0-4][0-9])\\.([0-1]?"
    + "[0-9]{1,2}|25[0-5]|2[0-4][0-9])\\."
    + "([0-1]?[0-9]{1,2}|25[0-5]|2[0-4][0-9])\\.([0-1]?"
    + "[0-9]{1,2}|25[0-5]|2[0-4][0-9]))|"
    + "([a-zA-Z]+[\\w-]+\\.)+[a-zA-Z]{2,4})$"
  ).matcher(email).matches()
}

There is an easier solution for Android:

fun isEmailValid(email: String): Boolean { 
    return android.util.Patterns.EMAIL_ADDRESS.matcher(email).matches()
}

from android.util.Patterns

private val emailRegex = compile(
        "[a-zA-Z0-9\\+\\.\\_\\%\\-\\+]{1,256}" +
                "\\@" +
                "[a-zA-Z0-9][a-zA-Z0-9\\-]{0,64}" +
                "(" +
                "\\." +
                "[a-zA-Z0-9][a-zA-Z0-9\\-]{0,25}" +
                ")+"
)

use:

emailRegex.matcher("john.doe@mail.com").matches()

or

fun String.isEmail() : Boolean {
    return emailRegex.matcher(this).matches()
}
"john.doe@mail.com".isEmail()

The pattern in the gist does not allow emails of type abc+3@example.com

There is an easier solution for Android:

fun isEmailValid(email: String): Boolean { 
    return android.util.Patterns.EMAIL_ADDRESS.matcher(email).matches()
}

Thanks alot, @sandboiii 👍