How to grep MATCH colored input?

Say I have output from a command that is colorized for the terminal. I want to match any line that contains the color yellow. How can I do this in grep, eg: mycommand -itSomtimesPrintsLinesWithYellowColorCodes | grep -e "?????" Note: This is NOT about colorizing the output of grep, or adding any colors. It's only about how to filter/match colored of input coming into grep.