From: snacktime <snacktime@...>
Date: 2006-08-12T17:57:07+09:00
Subject: perl tr and ruby String#tr

This, in perl:
$str  =~ tr/\0\200/\200\0/;

Produces a different result then this:

str.tr!("\0\200","\200\0")

How do I do this in ruby?