Communicating and collaborating in real time is the motto of Google Wave. Google wave has given its users the privilege to Search the waves on archives, folders, participants by providing vast range of Search Terms. The Search Terms in Google wave are Easily Readable and One Can Understand what the Search Term does.
Before I Start with a List of Google Wave Search Terms, I would Recommend you to Read my Previous Posts which comprises of List of Google wave Gadgets and Robots.
List of Google Wave Gadgets – Add Gadget by URL
List of Google Wave Robots – Add Bots as a Contact in Wave
Huge List of 125 Google Wave Robots – Add Bots and Enjoy
Searching Inside Google Wave!

The Above Screenshot Shows The Google Wave Search Box, which is used to perform various search queries within the waves.
Here is The Complete list of 50+ Search Queries followed by description used in Google wave to Make your Wave Life Better.
SEARCHING BY KEYWORD
about:keyword
This Search Term Finds all waves containing keyword anywhere in the content.
title:keyword
This Search Term Finds all waves containing keyword in the title.
caption:keyword
This Search Term Finds all waves containing an attachment where keyword occurs in the caption.
SEARCHING ON PARTICIPANTS
creator:name
This Search Term Finds all waves created by name.
participant:name
This Search Term Finds all waves where name is a direct participant (name may be a user or a group).
contributor:name
This Search Term Finds all waves where name edited at least one message.
to:name
This Search Term Finds all waves where name is a participant, but not the creator.
onlyto:name
This Search Term Finds all waves where name is the only participant, beside the creator.
onlyby:name
This Search Term Finds all waves where name is the only contributor.
onlywith:name
This Search Term Finds all waves where name is the only participant (name is either your own, or a group you belong to).
dfrom:name
This Search Term Finds all waves with a direct message from nameor waves with only two participants, where nameis a contributor.
dto:name
This Search Term Finds all direct messages to name, or waves with only two participants, where the other participant is also a contributor.
from:name
This Search Term Finds all waves in which name created at least one message within a wave.
to:name
This Search Term Finds all waves in which name is a participant but not the owner.
with:name
This Search Term Finds all waves in which name is a direct participant.
by:name
This Search Term Finds all waves in which name is a contributor.
onlyto:name
This Search Term Finds all waves in which name is the only participant besides the owner.
onlywith:name
This Search Term Finds all waves in which name is the owner and only participant on a message within a wave.
is:note
This Search Term Finds all waves in which you are the only participant.
[Using me as a participant name, refers to you. Example: with:me Finds all waves in which "me" is a direct participant.
SEARCHING ON THE STATE OF WAVE
is:read
This Search Term Finds all waves where all messages within the wave (including all private replies) have been read.
is:unread
This Search Term Finds all waves with at least one message that has not been read.
is:filed
This Search Term Searches over waves that have been filed into one of your folders.
is:unfiled
This Search Term Searches over waves that have not been filed (and are either still in:inbox or only in:all).
is:followed
This Search Term Searches over all waves that you follow.
is:unfollowed
This Search Term Searches over all waves that have been unfollowed.
SEARCHING BY DATE
past:date term
This Search Term Finds all waves within date term.
previous:date term
Finds all waves from the previous date term.
before:date term
This Search Term Finds all waves from before date term.
after:date term
This Search Term Finds all waves from after date term.
[Note: Accepted date terms: day, week , month, year. Example: past:2days lists all waves in past 2 days]
SEARCHING FOR WAVES WITH ATTACHMENTS
has:attachment
This Search Term Finds all messages with an attachment.
has:document
This Search Term Finds all messages with a document attached.
has:image
This Search Term Finds all messages with an image attached.
caption:term
This Search Term Finds all messages containing a picture, whose caption is the term on which you are searching.
filename:keyword
This Search Term Finds all waves with an attachment containing keyword in the filename.
mimetype:keyword
This Search Term Finds all waves with an attachment with mimetype containing keyword in the filename.
SEARCHING BY FOLDER
in:folder name
This Search Term Finds all waves in folder name.
in:search name
This Search Term Finds all waves in your saved search: search name.
is:unfiled
This Search Term Finds all waves you haven’t moved to a file you created.
is:filed
This Search Term Finds all waves you have moved to a file you created.
OTHER SEARCH OPERATORS
has:gadget
This Search Term Finds all waves containing any gadget.
has:gadgetname
This Search Term Finds all waves containing gadgetname.
gadgeturl:keyword
This Search Term Finds all waves containing a gadget with keyword in the URL.
gadgettitle:keyword
This Search Term Finds all waves containing a gadget with keyword in the title.
has:tag
This Search Term Finds all waves with any tag.
tag:name
This Search Term Finds all waves with the tag name.
tag:subtag
This Search Term Finds all waves with the combination.
title:term
This Search Term Finds all waves with term in the title.
attribute:value keyword
This Search Term Finds all waves with term
<.... attribute=value ...>, where keyword is a token in value.
has:link
This Search Term Finds all waves with links in them.
link:URL
This Search Term Finds all waves with a link to URL.
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