Standard Library
Below is the API for the OCaml standard library. It's directly copied over from the OCaml Manual, formatted to the Reason syntax and styled accordingly. The API docs are work-in-progress; we'll be polishing these gradually!
If you're targeting JavaScript, the API docs for BuckleScript includes all of below, plus JS-specific APIs.
sig type regexp val regexp : string -> Str.regexp val regexp_case_fold : string -> Str.regexp val quote : string -> string val regexp_string : string -> Str.regexp val regexp_string_case_fold : string -> Str.regexp val string_match : Str.regexp -> string -> int -> bool val search_forward : Str.regexp -> string -> int -> int val search_backward : Str.regexp -> string -> int -> int val string_partial_match : Str.regexp -> string -> int -> bool val matched_string : string -> string val match_beginning : unit -> int val match_end : unit -> int val matched_group : int -> string -> string val group_beginning : int -> int val group_end : int -> int val global_replace : Str.regexp -> string -> string -> string val replace_first : Str.regexp -> string -> string -> string val global_substitute : Str.regexp -> (string -> string) -> string -> string val substitute_first : Str.regexp -> (string -> string) -> string -> string val replace_matched : string -> string -> string val split : Str.regexp -> string -> string list val bounded_split : Str.regexp -> string -> int -> string list val split_delim : Str.regexp -> string -> string list val bounded_split_delim : Str.regexp -> string -> int -> string list type split_result = Text of string | Delim of string val full_split : Str.regexp -> string -> Str.split_result list val bounded_full_split : Str.regexp -> string -> int -> Str.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 end