This advanced syntax allows you to use search queries
to filter messages by properties such as the sender, date, or label to name a
few possibilities. For example, the following query retrieves all messages sent
by the user in January of 2014:
GET https://www.googleapis.com/gmail/v1/users/me/messages?q=in:sent after:2014/01/01 before:2014/02/01
In addition to search queries, you can also filter messages and threads by label
with the labelIds parameter. This allows you to search for messages and
threads with the specified system or user labels applied. For more information,
see the messages.list or
threads.list method reference.
Search and filter differences: Gmail UI versus Gmail API
The Gmail UI performs alias expansion which allows it to infer an
account alias from a Google Workspace account. For example, suppose you have an
account
of myprimary@mycompany.net and your admin sets up an alias for that account of
myalias@mycompany.net. If myalias@mycompany.net sends an email, but you
search for "from: myprimary@mycompany.net)" the email sent by
myalias@mycompany.net shows up as a search result the Gmail UI, but not in
the API response.
The Gmail UI allows users to perform thread-wide searches, but the API
doesn't.