Search understands basic boolean operators:

• AND: hello & world
• OR : hello | world
• NOT: hello -world -or- hello !world
• Grouping: (hello world)

It also supports the following extended matching capabilities:

• Field searching: @title hello @message world
• Phrase searching: "hello world"
• Word proximity searching: "hello world"~10
• Quorum matching: "the world is a wonderful place"/3

List of available fields:

• @title
• @message
• @filename
• @lower (artist name as it appears in their userpage URL)
• @keywords