Search URL parts

From The Unofficial Google Wiki

http://www.google.com/search?
        as_q            query                   czy+przej%B6cie+z+%22Jelenia+Gora%22
        num             results                 50
        hl              interface language      en
        inlang          ?                       pl
        ie              input encoding          ISO-8859-2
        oe              output enconding        ISO-8859-2
        as_epq          exact phrase query              
        as_oq           "at least One" query    
        as_eq           without query           
        lr              pages written in        lang_en|lang_pl         lang_cs lang_de 
        cr              pages located in        countryCZ       countryDE       countryUK|countryGB     countryIT       countryPL       countryUS
        as_ft           file format incl/excl   i               e
        as_filetype     file format             pdf             ps              doc             xls             ppt             rtf
        as_qdr          date                    all             m3              m6              y
        as_occt         occurrences             any             title           body            url (allinurl:) links (allinanchor:)
        as_dt           domain incl/excl        i               e
        as_sitesearch   domain                  
        safe                                    images          active
        filter          ommit similar           0                               "repeat the search with the omitted results included"
        sa              ?                       N       
        tab             ?                       gw