try String.sub s i j with Invalid_argument _ -> assert false
let heading_nl_RE = Pcre.regexp "^\\s*\n\\s*"
-let heading_nl_RE' = Pcre.regexp "^(\\s*\n\\s*)(.*)"
+let heading_nl_RE' = Pcre.regexp "^(\\s*\n\\s*)((.|\n)*)"
let only_dust_RE = Pcre.regexp "^(\\s|\n|%%[^\n]*\n)*$"
let multiline_RE = Pcre.regexp "^\n[^\n]+$"
let newline_RE = Pcre.regexp "\n"