Error: use curly braces to avoid double substitution

I'm truly baffled now. To make the changes I used the iRule editor, but after some time I noticed that the errors I was seeing when I ran load sys config verify in TMSH the changes weren't reflected in the error message.

Eventually I made the changes via the GUI and suddenly the verification passed.

To make it even more interesting, a couple of other rules also caused the same error message and I had updated those as well (added braces) via the iRule Editor. Those also kept showing with errors when I ran the verify command, but after I saved that one iRule in the GUI all of them suddenly passed.

iRule Editor problem?

Hi Arie,

I just gave it a try on v11.6.0HF3:

 

when HTTP_REQUEST {
    log local0. "path: [HTTP::path]; extracted <[string range [HTTP::path] [expr {[string length "/contact"] + 1}] end]>"
    HTTP::path "/[string range [HTTP::path] [expr {[string length "/contact"] + 1}] end]"
    log local0. "new path: [HTTP::path]"
}

 

Log output as expected:

 

 tail -n 0 -f /var/log/ltm | grep -oE 'Rule .*$'
Rule /Common/rule_string : path: /contact/stephan; extracted 
Rule /Common/rule_string : new path: /stephan

 

Verification fine as well:

 

 tmsh list ltm rule rule_string > /shared/rule_verify
 tmsh load sys config merge verify file /shared/rule_verify
Validating configuration...
  /shared/rule_verify

 

Thanks, Stephan