How to match Vendor specific attribute

[Vishnu]

Hi,

I am using freeradius as a proxy, I want to match the VSA with the if
statement and add another VSA based on that. Below mentioned is my
custom policy config.

custom_policy {
    if (NAS-Identifier =~ /DUBDC1-EX2200-*/) {
       if (%{Switch-User-Policy} =~ /.*switch-superuser.*/)
            update reply {
                Juniper-Local-User-Name = "switch-superuser"
            }
        }
    }
}

if i use .* instead of /.*switch-superuser.*/ it works. but i want to match
the string. Please let me know how i can achieve this.
Below is the Access accept message.

(0) Sent Access-Accept Id 203 from 10.108.25.102:1812 to 10.108.25.29:56849
length 44
(0)   Switch-User-Policy = "switch-superuser"

Thanks,
Vishnu