transforming character into rule in LaTeX

Daniel Molina lluvia at
Fri Sep 11 00:27:13 CEST 2020

On 8/9/20 17:37, Daniel Molina wrote:
> My original problem is to substitute any subformula with a rule of a
> specific color.

As a workaround I resolved the problem using an extended mathpalette in
LuaTeX as explained in

by egreg. In addition I used a colorbox and the same color for the font.
Apart from being around 3 times slower than LaTeX, it works.



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