Remove characters from logging Irule entry

can we use "string map"?

e.g.

% set clientip "192.168.1.5%1"
192.168.1.5%1
% put [string map {%1 ""} $clientip]
192.168.1.5

There are actually many ways to do this, some static (like string map), and some dynamic (like regsub),

% time { regsub {%\d+} $ip "" } 1000
1.996 microseconds per iteration

% time { string map {%1 ""} $ip } 1000
0.661 microseconds per iteration

But then you have to be careful that the function you use doesn't negate the performance benefits of not modifying it at all.

Hello guys, Thanks for your reply. Kevin, i actually don't understand the how to use it from your examples.(sorry about it) I did understand yours nitass, and i forgot to mention something else. I actually need to match string that could be "%[1-9][1-9][1-9]" (in a regex syntax). But this is not working with tcl, the way i tried anyway.

I was showing you performance output using TCLSH from the command line and the time command. It's probably not likely that you have more than a few defined route domains, all of which you know about in advance, so a literal string map is probably most efficient:

set clientip [string map {%1 "" %2 "" %3 ""} [IP::client_addr]]
log local0. "Request from: $clientip"

If, however, you truly need something more dynamic, then a regular expression will work. Keep in mind of course that a regular expression is, in general, going to be more CPU-intensive.

set clientip [regsub {%\d+} [IP::client_addr] ""]
log local0. "Request from: $clientip

Hi Kevin,

I got it now. But still, i noticed that only the first number is removed "%[1-9]".

% string map {%1 "" %2 "" %3 ""} 10.10.10.10%223 10.10.10.1023

I may give you a wrong syntax. My routing domain can have id of 1 to 3 digits (eg. %1 or %123) so i need to remove until 3 digits after the "%".

Hoping that it's more clear for you. Thanking you Aurel

is tcl scan useful?

e.g.

% set test1 "10.10.10.10%1"
10.10.10.10%1
% set test123 "10.10.10.10%123"
10.10.10.10%123

% scan $test1 {%[^%%]%%%d} a b
2
% put $a
10.10.10.10
% put $b
1

% scan $test123 {%[^%%]%%%d} a b
2
% put $a
10.10.10.10
% put $b
123
%

is tcl scan useful?

e.g.

% set test1 "10.10.10.10%1"
10.10.10.10%1
% set test123 "10.10.10.10%123"
10.10.10.10%123

% scan $test1 {%[^%%]%%%d} a b
2
% put $a
10.10.10.10
% put $b
1

% scan $test123 {%[^%%]%%%d} a b
2
% put $a
10.10.10.10
% put $b
123
%

The scan and regsub commands both work on regular expressions, so both will do a better job of matching a dynamic set of numbers - at the expense of performance. I'm doubtful that you have a large set of dynamic route domain assignments, so given the assumption that 1) it's a small set, and 2) you already know what those RD values are, an explicit [string map] is probably more efficient. But I want to express that [string map] is an explicit search - you have to know what you're looking for. In your case, since "223" is the RD number, your syntax would look something like this:

string map {%223 "" %224 "" %225 ""} [IP::client_addr]

I found a way for removing the next number (only) after the "%", do you see how do the same for others digits that would follow ?

This is my Irule command : set client_ip [string trimright [IP::remote_addr] %1]

I am using now the proper function to get the route domain ID to which i prefix the "%".

But when using string map to replace it with "", it's not working. I'm wondering if this is an interpretation issue, because of the variable "$rd" ?

set rd "%[ROUTE::domain]" set client_ip [string map {$rd ""} [IP::remote_addr]]