+val split : string -> string -> string * string
+(** [split sep str] splits [str] at the first occurrence of the
+ separator [sep], returning the part before and the part after.
+ If separator is not found, return the whole string and an
+ empty string. *)
+
+val nsplit : ?max:int -> string -> string -> string list
+(** [nsplit ?max sep str] splits [str] into multiple strings at each
+ separator [sep].
+
+ As with the Perl split function, you can give an optional
+ [?max] parameter to limit the number of strings returned. The
+ final element of the list will contain the remainder of the
+ input string. *)
+