+
+let separators_RE_raw = "()<>@,;:\\\\\"/\\[\\]?={} \t"
+let ctls_RE_raw = "\\x00-\\x1F\\x7F"
+let token_RE_raw = "[^" ^ separators_RE_raw ^ ctls_RE_raw ^ "]+"
+let lws_RE_raw = "(\r\n)?[ \t]"
+let quoted_string_RE_raw = "\"(([^\"])|(\\\\\"))*\""
+let text_RE_raw = "(([^" ^ ctls_RE_raw ^ "])|(" ^ lws_RE_raw ^ "))+"
+let field_content_RE_raw =
+ sprintf
+ "^(((%s)|(%s)|(%s))|(%s))*$"
+ token_RE_raw
+ separators_RE_raw
+ quoted_string_RE_raw
+ text_RE_raw
+(*
+ (* following RFC 2616 specifications *)
+let field_value_RE_raw = "((" ^ field_content_RE_raw ^ ")|(" ^ lws_RE_raw^ "))*"
+*)
+ (* smarter implementation: TEXT production is included in the regexp below *)
+let field_value_RE_raw =
+ sprintf
+ "^((%s)|(%s)|(%s)|(%s))*$"
+ token_RE_raw
+ separators_RE_raw
+ quoted_string_RE_raw
+ lws_RE_raw
+
+let token_RE = Pcre.regexp ("^" ^ token_RE_raw ^ "$")
+let field_value_RE = Pcre.regexp ("^" ^ field_value_RE_raw ^ "$")
+
+let is_token s = Pcre.pmatch ~rex:token_RE s
+let is_field_name = is_token
+let is_field_value s = Pcre.pmatch ~rex:field_value_RE s
+
+let heal_header_name s =
+ if not (is_field_name s) then raise (Invalid_header_name s) else ()
+
+let heal_header_value s =
+ if not (is_field_value s) then raise (Invalid_header_value s) else ()
+
+let heal_header (name, value) =
+ heal_header_name name;
+ heal_header_value name