$ recognized as word boundary

[Felix Hao]

Description

class $Apple {
    void $func$tion() {
        this_x = 5;
        this$xx = 4;
        abc$xx = 5;
        x = 5;
        int abc$xx = 5;
        int abc_xx = abc$xx;
        $App$le this$_xx = abc$xx;
    }
}

Code like this messes up the highlight pretty bad. This is what looks like now:

This is what should look like:

Version:
7c3d0d3

[Ivan]

Other issues related to $: #33.