用于用户输入验证的 Azure Blob 存储正则表达式模式
Azure blob storage regex pattern for user input validation
我在 PowerShell (.NET Framework) 中开发了一个函数来从任何给定的 Azure Blob 存储中检索数据：到目前为止，一切顺利。
当涉及到验证用户输入时，不幸的是，我不能依赖外部模块或库，例如 Azure SDK for .NET 的 NameValidator Class。
尽管如此，文章 Naming and Referencing Containers, Blobs, and Metadata 详细介绍了命名规则，因此正则表达式模式可能会派上用场。
对于容器名称，我想出了这个，它似乎适合：
(?=^.{3,63}$)(?!.*--)[^-][a-z0-9-]*[^-]
容器名称
A container name must be a valid DNS name, conforming to the following
naming rules:
- Container names must start or end with a letter or number, and can contain only letters, numbers, and the dash (-) character.
- Every dash (-) character must be immediately preceded and followed by a letter or number; consecutive dashes are not permitted in
container names.
- All letters in a container name must be lowercase.
- Container names must be from 3 through 63 characters long.
对于 Blob 名称 但是我无法解决路径段的计数问题：
(?=^.{1,1024}$)(?<=^|\/)(\S*?)[^\.] (?=\/|$)
注意：Azure 存储模拟器已被弃用，因此超出范围。
Blob 名称
A blob name must conforming to the following naming rules:
- A blob name can contain any combination of characters.
- A blob name must be at least one character long and cannot be more than 1,024 characters long, for blobs in Azure Storage.
- The Azure Storage emulator supports blob names up to 256 characters long. For more information, see Use the Azure storage emulator for
development and testing.
- Blob names are case-sensitive.
- Reserved URL characters must be properly escaped.
- The number of path segments comprising the blob name cannot exceed 254. A path segment is the string between consecutive delimiter characters (e.g., the forward slash '/') that corresponds to the name
of a virtual directory.
- Note Avoid blob names that end with a dot (.), a forward slash (/), or a sequence or combination of the two. No path segments should end
with a dot (.).
The Blob service is based on a flat storage scheme, not a hierarchical scheme. However, you may specify a character or string delimiter within a blob name to create a virtual hierarchy. For example, the following list shows valid and unique blob names. Notice that a string can be valid as both a blob name and as a virtual directory name in the same container:
/a
/a.txt
/a/b
/a/b.txt
You can take advantage of the delimiter character when enumerating blobs.
注意：就在问这个问题之前，我发现这些可以回答我自己已经解决的问题或使用上述 class:
顺便问一下，有人知道 PowerShell 使用哪种风格的正则表达式吗？
你需要使用
^(?!.{1025})/?[^/]*[^/.](?:/[^/]*[^/.]){0,253}$
^(?=.{1,1024}$)/?[^/]*[^/.](?:/[^/]*[^/.]){0,253}$
参见regex demo。
详情:
^ - 字符串开头(?=.{1,1024}$) - 字符串应包含 1 到 1024 个字符(?!.{1025}) - 字符串不能超过 1025 个字符/? - 一个可选的 /[^/]*[^/.] - / 以外的零个或多个字符，然后是 / 和 .(?:/[^/]*[^/.]){0,253} - / 出现 0 到 253 次，后跟 / 以外的零个或多个字符，然后是 / 和 [=19= 以外的字符]$ - 字符串结尾。
我在 PowerShell (.NET Framework) 中开发了一个函数来从任何给定的 Azure Blob 存储中检索数据：到目前为止，一切顺利。
当涉及到验证用户输入时，不幸的是，我不能依赖外部模块或库，例如 Azure SDK for .NET 的 NameValidator Class。
尽管如此，文章 Naming and Referencing Containers, Blobs, and Metadata 详细介绍了命名规则，因此正则表达式模式可能会派上用场。
对于容器名称，我想出了这个，它似乎适合：
(?=^.{3,63}$)(?!.*--)[^-][a-z0-9-]*[^-]
容器名称
A container name must be a valid DNS name, conforming to the following naming rules:
- Container names must start or end with a letter or number, and can contain only letters, numbers, and the dash (-) character.
- Every dash (-) character must be immediately preceded and followed by a letter or number; consecutive dashes are not permitted in container names.
- All letters in a container name must be lowercase.
- Container names must be from 3 through 63 characters long.
对于 Blob 名称 但是我无法解决路径段的计数问题：
(?=^.{1,1024}$)(?<=^|\/)(\S*?)[^\.] (?=\/|$)
注意：Azure 存储模拟器已被弃用，因此超出范围。
Blob 名称
A blob name must conforming to the following naming rules:
- A blob name can contain any combination of characters.
- A blob name must be at least one character long and cannot be more than 1,024 characters long, for blobs in Azure Storage.
- The Azure Storage emulator supports blob names up to 256 characters long. For more information, see Use the Azure storage emulator for development and testing.
- Blob names are case-sensitive.
- Reserved URL characters must be properly escaped.
- The number of path segments comprising the blob name cannot exceed 254. A path segment is the string between consecutive delimiter characters (e.g., the forward slash '/') that corresponds to the name of a virtual directory.
- Note Avoid blob names that end with a dot (.), a forward slash (/), or a sequence or combination of the two. No path segments should end with a dot (.).
The Blob service is based on a flat storage scheme, not a hierarchical scheme. However, you may specify a character or string delimiter within a blob name to create a virtual hierarchy. For example, the following list shows valid and unique blob names. Notice that a string can be valid as both a blob name and as a virtual directory name in the same container:
/a
/a.txt
/a/b
/a/b.txt
You can take advantage of the delimiter character when enumerating blobs.
注意：就在问这个问题之前，我发现这些可以回答我自己已经解决的问题或使用上述 class:
顺便问一下，有人知道 PowerShell 使用哪种风格的正则表达式吗？
你需要使用
^(?!.{1025})/?[^/]*[^/.](?:/[^/]*[^/.]){0,253}$
^(?=.{1,1024}$)/?[^/]*[^/.](?:/[^/]*[^/.]){0,253}$
参见regex demo。
详情:
^- 字符串开头(?=.{1,1024}$)- 字符串应包含 1 到 1024 个字符(?!.{1025})- 字符串不能超过 1025 个字符/?- 一个可选的/[^/]*[^/.]-/以外的零个或多个字符，然后是/和. 以外的字符
(?:/[^/]*[^/.]){0,253}-/出现 0 到 253 次，后跟/以外的零个或多个字符，然后是/和 [=19= 以外的字符]$- 字符串结尾。