TODO: handle _ in latex

[czhang03]

in latex, we use \b to detect command boundary. However, _ does not match \b.

For example if we type \top_x, the \top symbol will not be prettified.

Any suggestion on how to modify the regex?

[tririver]

I use something like this which works:

    "ugly": "\\\\nabla\\s*",
    "pretty": "∇",
    "post": "_|\\^|\\b"

Fundamentally modifying word boundary may be a cleaner way. But I don't know how to do that.