Is こればよかった correct or not?


The [Tanos JLPT
list](http://www.tanos.co.uk/jlpt/skills/grammar/sentences/?grammarid=516)
contains this sentence:

> ディズニーランドはとても面白かったよ。君もこればよかったのに。 Disneyland was very interesting. You should
> have come with us.

But [the accepted answer at Chiebukuro for
『よかったら、一緒に来れば？』と誰かを誘ったりするときの「来れば？」ですが、...](http://detail.chiebukuro.yahoo.co.jp/qa/question_detail/q1327605988)
says:

> 東北辺りでは これば？と言う人もいます  
>  方言の一種ですね  
>  読み仮名を付ける場合は「くれば」しかありません

Also, my IMEs refuse to convert これば into 来れば, and Rikaichan does not give any
meaningful translation for これば.

Is there a contradiction, or am I misunderstanding something?

Is 来ればよかった correct?  
Is こればよかった correct?

If there are several definitions of "correct", I am interested in what JLPT
deems "correct".




I think the correct form in standard Japanese is [来]{く}ればよかったのに, since
[Wiki](http://ja.wikipedia.org/wiki/%E3%82%AB%E8%A1%8C%E5%A4%89%E6%A0%BC%E6%B4%BB%E7%94%A8)
says 仮定形 of 来る is くれ.

I think こればよかったのに is a typo or an error. Maybe the person who wrote this uses
a regional dialect and typed これば (unconsciously or carelessly?), and it was
not converted into kanji so they just left it as it was.




I think the correct form in standard Japanese is [来]{く}ればよかったのに, since
[Wiki](http://ja.wikipedia.org/wiki/%E3%82%AB%E8%A1%8C%E5%A4%89%E6%A0%BC%E6%B4%BB%E7%94%A8)
says 仮定形 of 来る is くれ.

I think こればよかったのに is a typo or an error. Maybe the person who wrote this uses
a regional dialect and typed これば (unconsciously or carelessly?), and it was
not converted into kanji so they just left it as it was.

