Search tasks or torrents with regular expressions

Users can filter the task list and torrent list by name using regular expressions. Examples:

• name contains key

key

• name contains key1 OR key2

key1|key2

• name contains key1 AND key2

(?=.*key1)(?=.*key2)

• name does NOT contain key

^(?!.*key)

• name contains NEITHER key1 NOR key2

^(?!.*(key1|key2))

• name does NOT contain key1, but contains key2

^(?!.*key1)(?=.*key2)