Scripting: Assign layer color based on file name?

Sorry if this is a basic question, I am a relatively newbie at AE from a Shake and Nuke background.

I am hoping it is possible to script something that will automatically assign layer colors based on a filename input.

Eg it will check the filename and if it finds xxx_yyyyy_zzz_RGB.#.tga it will assign "red" (based on the RGB tag), if it finds xxx_yyyyy_zzz_SHADOW.#.tga it will assign "green" (based on the SHADOW tag) etc.

Any pointers would be appreciated.

Matt