Comments ending in backslashes screw with expanded expressions

[Alhadis]

Pretty easy to reproduce; just use this grammar:

name: "Test"
scopeName: "text.test"
fileTypes: [""]
patterns: [{
    match: """(?x)
        (A| # Comment\
        B)
    """
}]

Removing the backslash from the end of the comment solves this issue:

[samcv]

There is also a problem if the commented lines end in a : as well.

[winstliu]

You know, I am going to guess that this is intended, since a trailing backslash often means to continue the line. I can't find any documentation about it though.

[samcv]

The problem occurs with :, so maybe the \ was intended, but the : probably wasn't.