How to write a ruby-regular expression that removes characters only in the first and last positions?

Question

I have a log file, most lines are quoted at the first and last characters, for example:

 "2010-09-09,13:33,"user logoff",0"

What is a ruby ​​regular expression to remove quotes from the head and tail? therefore, the result line looks like this:

 2010-09-09,13:33,"user logoff",0

Answer 1

str.gsub /^"|"$/, ''

Answer 2

Or without regular expressions:

string[1...-1]