Is correct markdown behavior:
foo_bar_baz
Underscores within a string of characters are causing emphasis on the surrounded text. I would think this would only happen when the underscores are surrounded by whitespace.
People succeed in answering Rich Collins's questions 37% of the time (32 successes in 86 attempts).
Answers by: Fear of Fish
As per the documentation: http://daringfireball.net/projects/markdown/syntax#em
The underscores work within words, you need to escape them with a backslash for them to function as underscores \_like this\_