type regexp = Pcre.regexp
type split_result =
  Pcre.split_result =
    Text of string
  | Delim of string
  | Group of int * string
  | NoGroup
type result = Netstring_pcre.result
val regexp : string -> regexp
val regexp_case_fold : string -> regexp
val quote : string -> string
val regexp_string : string -> regexp
val regexp_string_case_fold : string -> regexp
val string_match : ?groups:int -> regexp -> string -> int -> result option
val search_forward : ?groups:int -> regexp -> string -> int -> int * result
val search_backward : ?groups:int -> regexp -> string -> int -> int * result
val matched_string : result -> string -> string
val match_beginning : result -> int
val match_end : result -> int
val matched_group : result -> int -> string -> string
val group_beginning : result -> int -> int
val group_end : result -> int -> int
val global_replace : regexp -> string -> string -> string
val replace_first : regexp -> string -> string -> string
val global_substitute :
  ?groups:int -> regexp -> (result -> string -> string) -> string -> string
val substitute_first :
  ?groups:int -> regexp -> (result -> string -> string) -> string -> string
val split : regexp -> string -> string list
val bounded_split : regexp -> string -> int -> string list
val split_delim : regexp -> string -> string list
val bounded_split_delim : regexp -> string -> int -> string list
val full_split : regexp -> string -> split_result list
val bounded_full_split : regexp -> string -> int -> split_result list
val string_before : string -> int -> string
val string_after : string -> int -> string
val first_chars : string -> int -> string
val last_chars : string -> int -> string