You can combine
\color{} with
\enclose{} .
For example
\color{red}{ \enclose{updiagonalstrike,downdiagonalstrike}{ \color{black}{x+y} } }
produces
\[
\color{red}{
\enclose{updiagonalstrike,downdiagonalstrike}{
\color{black}{x+y}
}
}
\]
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