How to remove disclaimer from email body

Summary

I need to access the customer thread for searching with certain regular expressions and route the incident to a particular queue if the match is there. I want to search only in email body.

Content

Hello Everyone,

I need to access the customer thread for searching with certain regular expressions and route the incident to a particular queue if the match is there. I want to search only in email body and not in the disclaimer part of the email. Is there any way to remove the disclaimer from the email body?

Below is one approach that I tried: