Need a regex expert : That string

    \[\color{Blue}{4} \times 2 \times 5 \times \color{Blue}{25} = \underbrace{\color{Blue}{4} \times \color{Blue}{25}}_{100} \times 5 \times 2 = \underbrace{100 \times 5}_{500} \times 2 = 500 \times 2 = 1\ 000\]

I want to match remove all string like `\color{*}`

I think I am not very far...
https://regex101.com/r/gM1uW3/1

