Grok add_field from another field

I have a field "host" that looks like this:
I want to add a new field "env" containing only "b1". My filter:

grok {
match => {
"message" => "url:%{DATA:host}"
add_field => { "env" => ".*%{DATA:env}\.site\.com" }

How can I get a new field out of an existing field?

To extract the "b1" from host you could use

grok { match => { "host" => "%{WORD}-%{WORD:env}" } }
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