<!--- Provide a general summary of the issue in the Title above -->
Reported/asked about here: https://stackoverflow.com/q/52636973/13860
## Expected Behavior
<!--- If you're describing a bug, tell us what should happen -->
<!--- If you're suggesting a change/improvement, tell us how it should work -->
Creating a database called `!abcdef/_users` should fail, due to invalid DB name.
## Current Behavior
<!--- If describing a bug, tell us what happens instead of the expected
behavior -->
<!--- If suggesting a change/improvement, explain the difference from current
behavior -->
DB creation succeeds:
curl -v -X PUT http://admin:abc123@localhost:6004/\!abcdef%2F_users
* Trying ::1...
* TCP_NODELAY set
* Connected to localhost (::1) port 6004 (#0)
* Server auth using Basic with user 'admin'
> PUT /!abcdef%2F_users HTTP/1.1
> Host: localhost:6004
> Authorization: Basic YWRtaW46YWJjMTIz
> User-Agent: curl/7.52.1
> Accept: */*
>
< HTTP/1.1 201 Created
< Cache-Control: must-revalidate
< Content-Length: 12
< Content-Type: application/json
< Date: Sun, 07 Oct 2018 11:21:46 GMT
< Location: http://localhost:6004/%21abcdef%2F_users
< Server: CouchDB/2.2.0 (Erlang OTP/19)
< X-Couch-Request-ID: 8d5c83b3a4
< X-CouchDB-Body-Time: 0
<
{"ok":true}
* Curl_http_done: called premature == 0
* Connection #0 to host localhost left intact
## Possible Solution
<!--- Not obligatory, but suggest a fix/reason for the bug, -->
<!--- or ideas how to implement the addition or change -->
Seems likely that the "special case" for `_users` is just too permissive, such
as a regex not bound to the beginning of the string, or a similar error.
## Steps to Reproduce (for bugs)
<!--- Provide a link to a live example, or an unambiguous set of steps to -->
<!--- reproduce this bug. Include code to reproduce, if relevant -->
See curl command above.
## Your Environment
<!--- Include as many relevant details about the environment you experienced
the bug in -->
* Version used: CouchDB 2.2.0 via official Docker image
* Browser Name and version: curl 7.52.1
* Operating System and version (desktop or mobile): Debian 9.5
[ Full content available at: https://github.com/apache/couchdb/issues/1644 ]
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