# Folder and Message Selection

Each mailbox contains items organized into folders. Use the parameters in this section to choose which folders and messages to process and which to ignore.

You can select folders based on their paths from the root of the mailbox. You can use regular expressions to match these paths. For example, if a folder `Top` has a subfolder `Folder` its path would be `Top/Folder` and could be matched using the regular expression `Top/Folder`.

NOTE: Folder names in Exchange can contain `/` characters, which the connector uses as path separators. If you want to match folder names containing either `/` or `\` characters, you must escape them using a `\` character. Because regular expressions also use `\` as an escape character, you need to escape twice.

For example, if a folder `Top` has a subfolder `one/two`, the path of the subfolder is `Top/one\/two`. This lets you distinguish between a folder called `one/two` and a folder `one` with a subfolder `two`. A regular expression to match this path would look like this: `Top/one\\/two`.

Similarly, if a folder `Top` has a subfolder `one\two`, the path of the subfolder is `Top/one\\two`. A regular expression to match this path would look like this: `Top/one\\\\two`. In the regular expression, `\\\\` matches a literal `\\` in the path. The path contains `\\` because `\` in the folder name has been escaped.

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