For instance if you would like to filter on a date, you could use the following query:

LastModifiedTime>=01/06/2010

The actual format of the date depends on your regional settings (I’m using Dutch (nl-NL) in this case).

To search within a range of dates you can use the following query syntax:

LastModifiedTime:28/06/2010..30/06/2010

To exclude items you could use the following syntax:

LastModifiedTime<>28/06/2010

More info from MSDN about keyword syntax kan be found here: http://msdn.microsoft.com/en-us/library/ee558911.aspx

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SharePoint 2010 Search: Property Restriction in Keyword Queries is a post from: Peter Gerritsen's blog

This is done by specifying a keyword query like 9:”folder/subfolder”. In this case the searchproperty 9 contains the path of the item.

While this worked well on our development environments and most of the browsers we tested on, a some browsers it failed. My colleague Arthur discovered it had something to do with the language setting of the browser. When we used Dutch (nl-NL) as preferred language the standard core search results web part didn’t return any items when using a query with a “/” in the conditions.

If you execute a KeyWordQuery or FullTextSqlQuery in your own code you have the possibility to specify a culture to use in the search. Unfortunately the core search results web part doesn’t provide you with an option to do this easily. In the end I came up with a “hack” to make this work. Just change the preferred languages the browser sends with each request in the OnInit of a webpart that inherits from the standards core results web part like so:

protected override void OnInit(EventArgs e)
{
	if (!string.IsNullOrEmpty(CultureOverrideTo))
	{
		if (this.Page.Request.UserLanguages.Length > 0)
			this.Page.Request.UserLanguages[0] = “en-US”;
	}

	base.OnInit(e);
}

Note: Because this modifies the current request this can have some consequences on other web parts on your page. So use it with care.

UPDATE:

This same behavior can also occur in custom search code. To fix this, simply specify the Culture of your KeyWordQuery or FullTextSqlQuery.

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MOSS Search and browser languages is a post from: Peter Gerritsen's blog