Regex for detecting the same character more than five times?

[Henoffema]

I'm trying to figure out how to write a regex that can detect if in my string, any character is repeated more than five times consecutively? For example it wouldn't detect "hello", but it would detect "helloooooooooo".Any ideas? Edit: Sorry, to clarify, I need it to detect the same character repeated more than five times, not any sequence of five characters. And I also need it to work with any charter, not just "o" like in my example. ".{5,}" is no good because it just detects any sequence of any five characters, not the same character.