Filter active silences with regex

[grimz-ly]

If I query a silence through the api I notice "isRegex":false being returned if it was created on an exact label value.

Does this mean there is no way to query with regex and include the silence?

looking to match host=~dcc-.* and get hundreds of silences returned with this hostname prefix that were created in order to expire them all.

curl -g 'http://alertmanager:9093/api/v2/silences?filter=host=~"dcc-.*"'

returns nothing.