Escape special chars in RegEx?

I have a form, that sends the contents of a text field to my Rails application and I have to generate a regular expression of this string.

I tried it like this:

regex = /#{params[:text]}/

In general this is working, but if brackets or special characters are contained in the string, this method will not work.

I don't want Rails to take care of the chars. They should be escaped automatically.

I tried it like this:

/\Q#{params[:text]}\E/

but this isn't working either.