JIRA's share dialog does not accept email addresses with an apostrophe.

Steps to reproduce:
1. Open the share dialog for an issue or a search result.
2. In the share dialog, enter an email address which contains an apostrophe.

Expected Result:
The email address should be accepted.

Actual Result:
JIRA complains that the email address is invalid.

Note that while creating a user, JIRA accepts an email address with apostrophe.

UserListSuggestHandler should allow apostrophe in email