Kotlin validation extensions to validate email,phone number and many others

ValidationExtension.kt

import android.text.TextUtils
import android.widget.EditText
import androidx.appcompat.widget.AppCompatEditText

fun String.isEmpty(): Boolean {
    return (TextUtils.isEmpty(this)
            || this.equals("", ignoreCase = true)
            || this.equals("{}", ignoreCase = true)
            || this.equals("null", ignoreCase = true)
            || this.equals("undefined", ignoreCase = true))
}

fun AppCompatEditText.isValidEmail(): Boolean {
    val emailPattern = Regex("[a-zA-Z0-9._-]+@[a-z]+\\.+[a-z]+")
    return !this.text.toString().isEmpty() && this.text.toString().matches(emailPattern)
}

fun EditText.isValidEmail(): Boolean {
    val emailPattern = Regex("[a-zA-Z0-9._-]+@[a-z]+\\.+[a-z]+")
    return !this.text.toString().isEmpty() && this.text.toString().matches(emailPattern)
}

fun String.isValidEmail(): Boolean {
    val emailPattern = Regex("[a-zA-Z0-9._-]+@[a-z]+\\.+[a-z]+")
    return !this.isEmpty() && this.matches(emailPattern)
}