What's the fastest/most efficient way to count lines in Rebol?

Question

Given a string string, what is the fastest/most-efficient way to count lines therein? Will accept best answers for any flavour of Rebol. I\'ve been working unde

Answer 1

Do not know about performance, and the last line rule (r3).

>> length? parse "1^/2^/3" "^/"
== 3