\input{umtest-preamble} \usepackage{unicode-math} \begin{document} \newcommand\ARRAY[4]{% \begin{array}{cc} #1 & #2 \\ #3 & #4 \end{array}} \def\test{\[ \left.\left[\ARRAY a b c d\right] \middle\slash \left[\ARRAY 1 1 1 {\mathsf 0}\right] \right. \]} \setmathfont [slash-delimiter=frac]{Cambria Math} \setmathfont [range={\mathsfup}, Color=0000FF] {STIXGeneral} \test \setmathfont [slash-delimiter=frac, range="2044, Color=FF0000] {Cambria Math} \test \end{document}