var regex = /[A-Za-z]d[A-Za-z] ?d[A-Za-z]d/;

var match = regex.exec(value);

if (match){

    if ( (value.indexOf(-) !== -1 || value.indexOf( ) !== -1 ) && value.length() == 7 ) {

        return true;

    } else if ( (value.indexOf(-) == -1 || value.indexOf( ) == -1 ) && value.length() == 6 ) {

        return true;

    }

} else {

        return false;

}

The regex looks for the pattern A0A 1B1.
true tests:

A0A 1B1

A0A-1B1

A0A1B1

A0A1B1C << problem child

so I added a check for - or and then a check for length.

Is there a regex, or more efficient method?