Question

I am using Ruby on Rails 3.1.0 and I would like to validate a class attribute just to avoid to store in the database a string containing these characters: (blank space), <, >, ", #, %, {, }, |, \, ^, ~, [, ] and “`.

What is the regex?

Answer 1

Assuming it should also be non-empty:

^[^\] ><"#%{}|\\^~\[`]+$

Since someone is downvoting this, here is some test code:

ary = [' ', '<', '>', '"', '#', '%', '{', '}', '|', '\\', '^', '~', '[', ']', '`', 'a']
ary.each do |i|
  puts i =~ /^[^\] ><"#%{}|\\^~\[`]+$/
end

Output:

nil
nil
nil
nil
nil
nil
nil
nil
nil
nil
nil
nil
nil
nil
nil
0