How to match domains starting with "admin"

Mon Jul 9 18:57:38 CEST 2012

I have several sites on my servers, so I need to configure one admin
subdomain for each one. However, I don't want to make:

if (req.http.Host ~ "(?i)(admin.domain1.com|admin.domain2.com|
admin.domainN.com)?$") {}

Can I do this only with one regular expression of the type (admin\.(.*)) ?
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