test/original/emphasis_and_strong.unit

>>> single asterisks
before *em* after

<<<
<p>before <em>em</em> after</p>
>>> single underscores
before _em_ after

<<<
<p>before <em>em</em> after</p>
>>> double asterisks
before **strong** after

<<<
<p>before <strong>strong</strong> after</p>
>>> double underscores
before __strong__ after

<<<
<p>before <strong>strong</strong> after</p>
>>> unmatched asterisk
before *after

<<<
<p>before *after</p>
>>> unmatched underscore
before _after

<<<
<p>before _after</p>
>>> multiple spans in one text
a *one* b _two_ c

<<<
<p>a <em>one</em> b <em>two</em> c</p>
>>> multi-line
before *first
second* after

<<<
<p>before <em>first
second</em> after</p>
>>> not processed when surrounded by spaces
a * b * c _ d _ e

<<<
<p>a * b * c _ d _ e</p>
>>> strong then emphasis
**strong***em*

<<<
<p><strong>strong</strong><em>em</em></p>
>>> emphasis then strong
*em***strong**

<<<
<p><em>em</em><strong>strong</strong></p>
>>> emphasis inside strong
**strong *em***

<<<
<p><strong>strong <em>em</em></strong></p>
>>> mismatched in nested
*a _b* c_

<<<
<p><em>a _b</em> c_</p>
>>> cannot nest tags of same type
*a _b *c* d_ e*

<<<
<p><em>a _b </em>c<em> d_ e</em></p>