If its exceeding the field limits then you can put the code in script include and from there return true/false.

Like for yellow you could do this.

1) Create a script include (I named mine as TestDate)

2) Then call the script include (and function - which I named isYellow) from Styles

Could you please mark my answer as correct? It gives me few points on community.

Thank you!

-Tanaji

Please mark reply correct/helpful if applicable