Can I automatically italicise words after a comma?

I tend to agree with Willi here, but I also want to add a warning that this can go bad if you have names with commas in them, as John Smith, Jr., Tiny Tim.

You can do it with GREP style or with nested Style. I would recommend to use the nested style, as GREP styles can slow down large documents. 
None style up to including comma, italic end to marker.

The Grep string that can be used is

(?<=,).*

This will search anything after a comma. Is this what is needed or we need to stop after some words after comma.

-Manan

A GREP find/change could do this, or if you want it to be ongoing, a GREP style for the relevant paragraph styles would do it on the fly.

I'm shaky with GREP codes, but I'd bet one of the elves will provide a code string shortly if you aren't up to it either. 🙂

A Word macro could do it as well, if you have the doc in Word format. Not elegant, but it works.