[stable20] Use regex when searching on single file shares

[backportbot-nextcloud]

backport of #24203

[faily-bot]

🤖 beep boop beep 🤖

Here are the logs for the failed build:

Status of 35726: failure

acceptance-header

• tests/acceptance/features/header.feature:57

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  Scenario: search for other users in the contacts menu                              # /drone/src/tests/acceptance/features/header.feature:57
    Given I am logged in as the admin                                                # LoginPageContext::iAmLoggedInAsTheAdmin()
    And I open the User settings                                                     # SettingsMenuContext::iOpenTheUserSettings()
    And I click the New user button                                                  # UsersSettingsContext::iClickTheNewUserButton()
      New user button in Users Settings could not be found (NoSuchElementException)
    And I see that the new user form is shown                                        # UsersSettingsContext::iSeeThatTheNewUserFormIsShown()
    And I create user user1 with password 123456acb                                  # UsersSettingsContext::iCreateUserWithPassword()
    And I see that the list of users contains the user user1                         # UsersSettingsContext::iSeeThatTheListOfUsersContainsTheUser()
    And I open the Contacts menu                                                     # ContactsMenuContext::iOpenTheContactsMenu()
    And I see that the Contacts menu is shown                                        # ContactsMenuContext::iSeeThatTheContactsMenuIsShown()
    And I see that the contact "user0" in the Contacts menu is shown                 # ContactsMenuContext::iSeeThatTheContactInTheContactsMenuIsShown()
    And I see that the contact "user1" in the Contacts menu is shown                 # ContactsMenuContext::iSeeThatTheContactInTheContactsMenuIsShown()
    And I see that the Contacts menu search input is shown                           # ContactsMenuContext::iSeeThatTheContactsMenuSearchInputIsShown()
    When I search for the user "user0"                                               # ContactsMenuContext::iSearchForTheUser()
    Then I see that the contact "user1" in the Contacts menu is eventually not shown # ContactsMenuContext::iSeeThatTheContactInTheContactsMenuIsEventuallyNotShown()
    And I see that the contact "user0" in the Contacts menu is shown                 # ContactsMenuContext::iSeeThatTheContactInTheContactsMenuIsShown()
    And I see that the contact "admin" in the Contacts menu is not shown             # ContactsMenuContext::iSeeThatTheContactInTheContactsMenuIsNotShown()