Ruby experts:

Please advise how I can make a gsub operation NOT case sensitive, so that for example this command:

   some_big_string.gsub!(/soMe_sUbString_1/, some_substring_2)

would do a replacement of all occurances of "soMe_sUbString_1" regardless of the case of the target string in some_big_string. Eg, the text "SOME_SUBSTRING_1" in some_big_string WOULD be replaced by "some_substring_2" using the command (or technique) I'm looking for.

Thanks.

-Kurt Euler