Text filters in a Helpshift automation all rely upon the automatic comparison of two or more text strings. 
- App
 - Forwarding Email
 - Tags
 - Title or First Message
 
Text filters all follow a uniform set of rules. 
- When strings are not case sensitive — "book" matches "bOoK"
 - When variants do not match — "book" does not match "books" or "booking"
 - When substrings do not match — "book" does not match "textbook"
 - When an underscore is a delimiter — "book" matches "old_book"
 - When a hyphen is a delimiter — "book" matches "old-book"