let http_scheme_RE = Pcre.regexp ~flags:[`CASELESS] "^http://"
let file_scheme_RE = Pcre.regexp ~flags:[`CASELESS] "^file://"
let dir_sep_RE = Pcre.regexp "/"
let http_scheme_RE = Pcre.regexp ~flags:[`CASELESS] "^http://"
let file_scheme_RE = Pcre.regexp ~flags:[`CASELESS] "^file://"
let dir_sep_RE = Pcre.regexp "/"