Mar 27, 2026 - For details about updated CVE-2025-53521 (BIG-IP APM vulnerability), refer to K000156741.

Forum Discussion

Tim_Petersen_15's avatar
Tim_Petersen_15
Icon for Nimbostratus rankNimbostratus
May 23, 2014

Convert from ACE

Hi, I have converted from Cisco's ACE to the LTM. I am having a problem building one of the custom stickys that Cisco helped us build. Can anyone help convert this:(as it sits this is ACE language) ...
application delivery
devops
irules
LTM
John_Alam_45640's avatar
John_Alam_45640
Historic F5 Account
May 23, 2014

ACE regex engine is likely to be different than the one used by iRules. iRules use tcl regex.

BigiP uses tcl version 8.4, so according to this page: http://www.regular-expressions.info/nonprint.html you need four digits after the \x

so try this:

(\\x0020|\\x0000\\xST|([^\\x0020 ^\\x0000]\\xST))

HTH

  • Tim_Petersen_15's avatar
    Tim_Petersen_15
    Icon for Nimbostratus rankNimbostratus
    May 23, 2014
    Bummer, didn't work. Let me explain more of what we are doing and maybe someone can help me find out what it should be. When we take a lync call, our front ends send the call off to be recorded. We need that to be persistent, but we can't use the built in sip persistence because it is converted to RTAudio. Somehow we have to do a layer 4 offload inspection to get that hash. I guess it is possible I am using the wrong begining hash... is there a way to log what the F5 sees at that offset? If I remove the start pattern the call seems to go through without an issue, as soon as I add anything the call fails.