showdown/test/features/#164.2.disallow-underscore-emphasis-mid-word.md

this is a sentence_with_mid underscores

this is a sentence with just_one underscore

this should be parsed as emphasis

this is double__underscore__mid word

this has just__one double underscore

this should be parsed as bold

emphasis at end of sentence

emphasis at line start

multi line emphasis yeah it is yeah