Highlight instances of found text

[Sivakatirswami]

Does anyone have a function that will highlight/colorize instances of 
found text in a field?

e.g. say we have a search function, user types "chapati"

In the particular ebook I have, all instances (lines or paragraphs 
containing) of "chapati" are "gathered" and then posted to a field for 
review... I would like to have all instance of "chapati" in that field 
be highlighted or colorized.

I'm sure I can figure it out but someone I'm sure has already cooked 
this dosai before and I'm a fan of using recipes.

Thanks
Sivakatirswami