RegEx - Pattern Match

Showing results for 
Show  only  | Search instead for 
Did you mean: 

RegEx - Pattern Match

Not applicable

Hey everyone,

I'm attempting to build a pattern match for a custom vulnerability.  Here are the criteria:

  • File is always a random 24 character file with a '.exe' extension
  • First three characters are always 'e54'

I had the following regex built, but the PA doesn't like it for some reason.


It gives me some invalid character internal error.  Any thoughts?


L2 Linker

Hi Guys,

I'm trying to create the pattern to reset the connection if the connection comes from Internet Explorer.

I took PCAP with wireshark and user-agent shows as : "Mozilla/5.0 (Windows NT 6.1; WOW64; Trident/7.0; rv:11.0) like Gecko" (there is \r\n at the end but I think its wireshark? )


I copied my text to RegExr; and did my regular expression to match.


it highlights the text, meaning It is a valid expression, Palo Alto takes it, and while I was troubleshooting I even got some hits but internet explorer works as normal.

Can you tell if this is even possible?



I know this is an old thread but anyone knows why this particular string is not accepted as a pattern for SNI with ssl client hello as context? It keeps telling me it has to be at least 7 byte long.


All the above cannot go through..


i randomly try,,, all is ok.


Hope somone can help! Thanks! 

Like what you see?

Show your appreciation!

Click Like if a post is helpful to you or if you just want to show your support.

Click Accept as Solution to acknowledge that the answer to your question has been provided.

The button appears next to the replies on topics you’ve started. The member who gave the solution and all future visitors to this topic will appreciate it!

These simple actions take just seconds of your time, but go a long way in showing appreciation for community members and the LIVEcommunity as a whole!

The LIVEcommunity thanks you for your participation!