Normal Header

plain text

Normal Header with trailing space

Normal Header with trailing space

plain text

plain text

and more plain text

Header with Link and space

and more plain text

The following should still be detected as headers:

Broken label [ text [

Test Header 2 and

Broken Reference Link [label][label2]

Reference link not label label

Link not label

And link to [label2] and label1 and label.