lpad on regular expression matches does not work

4 Mar 2021

      Hello all,

I try to improve Calling-Station-Id MAC address canonicalization a 
little bit, so that
is should left pad MAC octets with zeroes.

I modified default settings as is:

mac-addr-regexp = 
'([0-9a-f]{1,2})[:\-\.]([0-9a-f]{1,2})[:\-\.]([0-9a-f]{1,2})[:\-\.]([0-9a-f]{1,2})[:\-\.]([0-9a-f]{1,2})[:\-\.]([0-9a-f]{1,2})'

This regular expression matches example MAC address properly:

     [0] => 18:d0:71:f3:70:8
     [1] => 18
     [2] => d0
     [3] => 71
     [4] => f3
     [5] => 70
     [6] => 8

Then I want to make the whole thing this way:

rewrite_calling_station_id {
	if (&Calling-Station-Id && (&Calling-Station-Id =~ 
/^${policy.mac-addr-regexp}$/i)) {
		update request {
			&Calling-Station-Id := "%{toupper:%{lpad:%{1} 2 0}:%{lpad:%{2} 2 
0}:%{lpad:%{3} 2 0}:%{lpad:%{4} 2 0}:%{lpad:%{5} 2 0}:%{lpad:%{6} 2 0}}"
		}
		updated
	}
	else {
		noop
	}
}

And here's surprise - lpad expression function handles only attribute 
parameters (ex. {lpad:&User-Name 100 0}),
but not regexp matches. What am I doing wrong?

-- 
Bests,
Tomasz Chiliński, Chilan
opiekun projektu LMS - https://lms.org.pl
kierownik projektu LMS Plus / LMS+ - https://lms-plus.org

-- 
Pozdrawiam
Tomasz Chiliński, Chilan
opiekun projektu LMS - https://lms.org.pl
kierownik projektu LMS Plus / LMS+ - https://lms-plus.org