Hiding email signatures processing order

[Robert Condon]

I'm having some issues with the custom rules for hiding email signatures and was wondering what the processing logic is on them

Rules to detect signatures

regards
thanks
thank you

Scenario
JSM receives a long email email thread which triggers more than one of the Custom Rules. From newest to oldest thanks>regards

Problem
JSM is detecting the email signature on 'Regards' not on 'thanks

Question
How is JSM prioritising multiple signature rules, as I would assume it would scan from top to bottom and process in that order, but that does not seem to be the case
Best I can tell it is either:

1. Scanning from bottom to top (which seems very counter intuitive)
2. Processing the whole email for first custom rule, then not processing any of the following rules if it triggers the first rule.
   This seems to fit what is happening, but it would be good to get confirmation. 

Can anyone confirm. I have read Hide email signatures from the issue view and portals | Jira Service Management Cloud | Atlassian Support but this doesn't clarify

Thanks in advance