The RDS API reference doesn't say dots are allowed, but they are. For
the sake of people who have preexisting resources with dots in the
names, we should allow them also. Fixes#2664.
AWS accepts uppercase DB Subnet Group names - it just automatically
downcases them. We already had logic to handle that - so we
intentionally had an acctest with uppercase characters that was now
failing.
Loosening the regexp to allow uppercase letters for now - we can discuss
if we want to tighten the validation as a separate question.
/cc @radeksimko @catsby
This landed in aws-sdk-go yesterday, breaking the AWS provider in many places:
3c259c9586
Here, with much sedding, grepping, and manual massaging, we attempt to
catch Terraform up to the new `awserr.Error` interface world.
Phil Frost