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# Wildcard Paths for Cloud Storage

## Using Wildcards in Path Specifications

Our cloud storage paths support wildcards (`**`) to facilitate flexible file and directory matching. Here are the guidelines for using wildcards:

* **Wildcard Placement**: Wildcards can be used at the beginning or end of a sub-directory name.

  * `**` matches any sequence of sub-directories.

  * `**abc**` matches any sub-directories containing "abc".

  * `abc**` matches sub-directories starting with "abc".

  * `**abc` matches sub-directories ending with "abc".

* **Multiple Wildcards**: If you know the exact number of sub-directory layers between your bucket and your desired sub-directory, you must declare each layer of wildcards.

  * Example for three intermediary layers: `s3://bucket/**/**/**/model`

* **Limitation on Layers**: You can use up to three layers of wildcards (`**`).

* **No Mid-String Wildcards**: Wildcards are not supported in the middle of a path segment.

  * Examples of invalid usage: `**abc**def`, `abc**def`, `abc****def`

Please ensure your path specifications adhere to these guidelines to avoid validation errors.