[exim] Searching Regex From A File

Exim 4.69

Is there a way to search a file that contains regular expressions of
sender host names?

I've attempted to search the archives and the wiki and have come up
with nothing. I have tried the following with no success.

/etc/exim/skip_greet_grey_spam:
\N^imta\-[0-9]{1,2}\.everyone\.net$\N

acl_check_connect:

   #       Exempt certain hosts from the greeting delay.
   accept  hosts         = +relay_from_hosts
   accept  condition     = ${if  
match{$sender_host_name}{lsearch;/etc/exim/skip_greet_grey_spam}{yes}{no}}

   #       Accept the connection if they have waited for
   #       the SMTP greeting.
   accept  delay         = 5s