regex for dns update

[Tom Schmitt]

Hi,

my dhcpd is sending DNS-updates to the DNS server when a lease is given to a dhcp client with the name the dhcp client is providing.

Now I want this only if the name is following a given pattern, something like:

if($clientname=~/^[A-Za-z]{4}\d{4}$/) {
     send_dns_update;
}
else {
     dont_send_a_dns_update;
}

Can anyone tell me, what the syntax is to configure this on a global scope in dhcpd.conf?

Or a link where the syntax is explained?

Thanks, 
Tom.
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