Class used to validate that a string matches a certain set of criteria

PasswordValidator.kt

class PasswordValidator {

    fun isValid(password: String) = PATTERN.matcher(password).matches()

    private companion object {
        val PATTERN: Pattern = Pattern.compile("^(?=.*?[A-Z])(?=.*?[a-z])(?=.*?[0-9])(?=.*?[#?!@\$%^&*-]).{8,}\$")
    }
}