Hashtag without following space shouldn't be interpreted as header.

[mawek]

It is common to have twitter like tags in text and they shouldn't be interpreted as headers as mentioned here

[tivie]

1. Showdown follows the original markdown spec and not commonmark (which is a spinoff or flavor).

2. # followed by text is only interpreted as an header if # starts a newline, not in the middle of the text

3. A space between # and the text can become mandatory for headers if you enable the option requireSpaceBeforeHeadingText, as stated in showdown's documentation:

   requireSpaceBeforeHeadingText: (boolean) [default false] Makes adding a space between # and the header text mandatory (since v1.5.3)

[tivie]

Duplicate #277

[mawek]

Thanks for quick response. I missed the requireSpaceBeforeHeadingText option.