fix regex.

Hi.

In my Windows, I can't get a result of `OmniSharpBuild`. 
I think that it is because Japanese csc.exe is probably the cause.


__Example__
>c:\Users\rbtnn\Hoge\a.cs(161,17): error CS1501: 引数を 2 個指定できる、メソッド 'TooFewColumnsError' のオーバーロードはありません [C:\Users\rbtnn\Hoge\A.csproj]