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Docs: Be more clear when specifying valid formats for strings

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- Use the word letter rather than character to refer to letters ;) when trying to specify that only letters and numbers can be used, and not ANY character...
- Small corrections

Fixes #29821

Signed-off-by: Timothy Hobbs <timothy@hobbs.cz>
This commit is contained in:
Timothy Hobbs
2017-01-02 22:06:46 +01:00
committed by Tibor Vass
parent 0705425584
commit 46c619655f
2 changed files with 9 additions and 8 deletions
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8
docs/reference/commandline/tag.md
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@@ -29,13 +29,13 @@ by a registry hostname. The hostname must comply with standard DNS rules, but
may not contain underscores. If a hostname is present, it may optionally be
followed by a port number in the format `:8080`. If not present, the command
uses Docker's public registry located at `registry-1.docker.io` by default. Name
components may contain lowercase characters, digits and separators. A separator
components may contain lowercase letters, digits and separators. A separator
is defined as a period, one or two underscores, or one or more dashes. A name
component may not start or end with a separator.
A tag name may contain lowercase and uppercase characters, digits, underscores,
periods and dashes. A tag name may not start with a period or a dash and may
contain a maximum of 128 characters.
A tag name must be valid ASCII and may contain lowercase and uppercase letters,
digits, underscores, periods and dashes. A tag name may not start with a
period or a dash and may contain a maximum of 128 characters.
You can group your images together using names and tags, and then upload them
to [*Share Images via Repositories*](https://docs.docker.com/engine/tutorials/dockerrepos/#/contributing-to-docker-hub).