final emailRegExp = RegExp(r"^[a-zA-Z0-9.]+@[a-zA-Z0-9]+\.[a-zA-Z]+"); final nameRegExp = RegExp(r"^\s*([A-Za-z]{1,}([\.,] |[-']| ))+[A-Za-z]+\.?\s*$"); final phoneRegExp = RegExp(r"^\+?0[0-9]{10}$"); final passwordRegExp = RegExp(r'^.+$'); extension valString on String { bool get isValidEmail { return emailRegExp.hasMatch(this); } bool get isValidName { return nameRegExp.hasMatch(this); } bool get isValidPassword { return passwordRegExp.hasMatch(this); } bool get isNotEmpty { return this != trim(); } bool get isValidPhone { return phoneRegExp.hasMatch(this); } }