Using psql variables in DO-blocks

Hi all.
 
I'm trying to use a psql variable in a DO-block, but it fails:
 
\set resource_group 'Ressurser' \set quoted_resource_group '\''
:resource_group '\'' DO $$ begin if not exists(SELECT * FROM tbl_group WHERE
groupname = :quoted_resource_group)then raise notice 'Group % not found,
creating it.', :quoted_resource_group; end if; end; $$;
 
ERROR:  syntax error at or near ":"
LINE 3: ... exists(SELECT * FROM tbl_group WHERE groupname = :quoted_re...
                                                           ^
 
Any hints?
 
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