You need to understand how to use regex

I only do logs of SYN packets so missing a lot of noise.. But here is example of proper use of regex.. So when I just put in 23 it going to match pretty much anything that has 23 in it.. 2323, 5623, 1423, etc. etc..
First image.. If use the correct regex for what exactly I want - just port 23.. nothing more nothing less with ^23$ then that is all you get.. See in first post there were 3 hits with hit before at 15:19:49 and hit after at 15:13:33 now in second sniff those are missing..