I'm reading a book on Ruby, and I just started a little while ago. I have gotten some decent ground and they just introduced Regular Expressions, but for some reason I can't get them to work. Take this code for example:


line = "Perl"
line.sub(/Perl/, 'Ruby')
puts line

When I run the code I still see "Perl" getting printed to the string when it should have replaced it with "Ruby". Also, when I do stuff like:


line = "Yes I like Ruby"
if line =~ /Ruby/
puts line
end

Instead of printing the index of where the expression starts (like the book says) it just prints out the string again.

Am I doing something wrong?

Cheers,
~ Alias