Hello, InDesign team.

Please consider allowing users to assign a color to each GREP style, which would be applied as a highlight to text affected by the style. The highlight would, of course, be on-screen only, like the existing highlights for composition problems etc. This would be a quick way to ensure that the style is matching the correct text, without doing what I do now (which is to manually add a color highlight into the definition of each GREP style and then remove them later). Especially helpful for GREP styles whose effect is subtle. Characters affected by multiple GREP styles would either display a multicolored highlight (?) or show the color of the last style applied, reflecting the order of the GREP styles.

Thank you.