Expanding the Key API by adding methods to check if a string may be parsed into a Key

[Steanky]

Basically what the title says.

From what I've seen, the only way to check if a string (or namespace:value combination) is a valid Key is by:

1. Duplicating the validation logic in KeyImpl
2. Using exception handling as a control flow mechanism, e.g.

public static boolean isValidKey(String namespace, String value)
    try {
        Key.key(namespace, string);
        return true;
    }
    catch (InvalidKeyException ignored) {
        return false;
    }
}

Both of these options work, but aren't particularly elegant in my opinion. Instead, it would be better if the Key interface included isValidKey-like methods corresponding to the Key#key overloads.

This would be primarily useful for validating user input.

[kezz]

Sounds great, exposing a regex + method to validate would be very helpful!

[kezz]

Sounds great, exposing a regex + method to validate would be very helpful!