[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()