# UserMailboxMustHaveRegex

A regular expression to restrict the Exchange Online mailboxes that are processed. A mailbox is not processed unless it matches the regular expression. This parameter is used only when you set CrawlExchangeOnlineMailboxes to `true`.

Type: | String (regular expression)
Default: |
Required: | No
Configuration Section: | TaskName or FetchTasks
Example: | `UserMailboxMustHaveRegex=user@\.domain\.com`
See Also: | CrawlExchangeOnlineMailboxes ExchangeOnline

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