TLS Fingerprinting - a method for identifying a TLS client without decrypting

Hello, Kevin Stewart here. A while back someone asked an interesting question in the DevCentral forum about selecting a client SSL profile based on the device (ex. iOS, Android, Windows Phone). Norma...
Published Dec 30, 2016
Version 1.0
application delivery
BIG-IP
iRules
security
ssl
tls
nomæd's avatar
nomæd
Icon for Employee rankEmployee
Nov 01, 2018

While 

regsub {(.)A\1A} ${exte} "" exte
is fine in CLI, BIG-IP's TCL complains about this:

warning: ["\1" has no meaning.  Did you mean "\\1" or "1"?][{(.)A\1A}]