I have a script that I wrote that uses nokogiri to parse some HTML, the results 
I get back, I need to change several of the HTML entities (><&), I thought I 
could stack the gsub! commands so they would be something like this: 

my_string.gsub!(/>/, "&lt;").gsub!(/</, "&gt;)

but I found that work, so for now I'm using: 

my_string.gsub!(/>/, "&lt;")
my_string.gsub!(/</, "&gt;)

which works, but I'm sure is horribly inefficient. Is there a better way to do 
multiple global substitutions on a string? 

Wayne