[Puppet Users] using file_line with match

I´m using stdlib 3.2 on my 3.0.1 master/agent

my goal is to replace a line within a configuration file to add one more
server like this:
file_line { "xxx": line => "ALLOWHOST server1|server2", path => "/tmp/sw",
match => "^ALLOWHOST$", ensure => present }

I´ve tried to use match to ensure that the existing line is changed, but
I´m getting this error message:
Error: Failed to apply catalog: When providing a 'match' parameter, the
value must be a regex that matches against the value of your 'line'
parameter

how can I solve this?

thanks
,
Stefan