(string-split string1 string2) -> list
Divides string1 at the first occurrence of string2, removing that occurrence. Returns a list containing one or two strings. If string2 is not found within string1, string1 is returned, unmodified.
Examples:
>>(string-split "a,b,c,d" ",") :: ("a" "b,c,d")
>>(string-split "a,b,c,d" "!") :: ("a,b,c,d")
See Also: string-split*