## in debugger
(rdb:6) test = Content.find(1229)
#<Content id: 1229, data: "[comment_remove_button]">
(rdb:6) test.data.gsub!("[comment_remove_button]", "test")
"test"
(rdb:6) test.reload
#<Content id: 1229, data: "test">

## in console
>> test = Content.find(1229)
=> #<Content id: 1229, data: "[comment_remove_button]">
>> test.data.gsub!("[comment_remove_button]", "test")
=> "test"
>> test.reload
=> #<Content id: 1229, data: "[comment_remove_button]">
>>