Segment filtering

Hi all,

I am working on a huge project involving millions of ICE matches that need to be checked, and I need to F&R a whole segment.

For instance, I need to search for the word "Part" but not everywhere, only in segments containing that word alone. Same happens with "The", "not", etc. 

I know this might be a very basic question, but I am not good at using regular expressions, only the basics.

Thanks in advance,

Eugenia