Syntax highlighting bug for fields

[natemcmaster]

Environment data

dotnet --info output: n/a
VS Code version: 1.5.2
C# Extension version: 1.4.1

Steps to reproduce

public class Test
{
    public string _field1 = Path.Combine("",method());
    public string _field2 = Path.Combine("", method());
    public string _field3 = "";
}

Highlighter gets into an incorrect state trying to highlight _field2.

[DustinCampbell]

Interesting. 😄. Usually the regular expressions fail at the starts/ends of tokens. cc @ivanz.

[ivanz]

Hmm I am not sure what's going on here, because the "variable" regex (https://github.com/OmniSharp/omnisharp-vscode/blob/master/syntaxes/csharp.json#L85) seems fine outside of the grammar file: http://regexr.com/3e9vo