Does OCaml have String.split function like Python?

Since OCaml 4.04.0 there is also String.split_on_char, which you can combine with List.filter to remove empty strings:

# "pop     esi"
  |> String.split_on_char ' '
  |> List.filter (fun s -> s <> "");;
- : string list = ["pop"; "esi"]

No external libraries required.

Using Jane Street's Core library, you can do:

let python_split x =
  String.split_on_chars ~on:[ ' ' ; '\t' ; '\n' ; '\r' ] x
  |> List.filter ~f:(fun x -> x <> "")
;;

Don't use Str.regexp_string, it's only for matching fixed strings.

Use Str.split (Str.regexp " +")

This is how I split my lines into words:

open Core.Std
let tokenize line = String.split line ~on: ' ' |> List.dedup

Mind the single quotes around the space character.

Here's the documentation for String.split: link

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